247728051 has 32 divisors (see below), whose sum is σ = 373920000. Its totient is φ = 164094984.

The previous prime is 247728043. The next prime is 247728059. The reversal of 247728051 is 150827742.

247728051 = T₁₄₄ + T₁₄₅ + ... + T₁₁₄₁.

247728051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (247728043) and next prime (247728059).

It is not a de Polignac number, because 247728051 - 2³ = 247728043 is a prime.

It is a super-2 number, since 2×247728051² = 122738374504517202, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 247727997 and 247728015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247728059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 496200 + ... + 496698.

It is an arithmetic number, because the mean of its divisors is an integer number (11685000).

Almost surely, 2^247728051 is an apocalyptic number.

247728051 is a deficient number, since it is larger than the sum of its proper divisors (126191949).

247728051 is an frugal number, since it uses more digits than its factorization.

247728051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 36.

The square root of 247728051 is about 15739.3789902906. The cubic root of 247728051 is about 628.0463972036.

It can be divided in two parts, 24772 and 8051, that added together give a palindrome (32823).

The spelling of 247728051 in words is "two hundred forty-seven million, seven hundred twenty-eight thousand, fifty-one".