247620813 has 12 divisors (see below), whose sum is σ = 362904864. Its totient is φ = 150073000.

The previous prime is 247620803. The next prime is 247620869. The reversal of 247620813 is 318026742.

247620813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 247620813 - 2¹⁸ = 247358669 is a prime.

It is a super-2 number, since 2×247620813² = 122632134061561938, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (247620803) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 340713 + ... + 341438.

It is an arithmetic number, because the mean of its divisors is an integer number (30242072).

Almost surely, 2^247620813 is an apocalyptic number.

It is an amenable number.

247620813 is a deficient number, since it is larger than the sum of its proper divisors (115284051).

247620813 is a wasteful number, since it uses less digits than its factorization.

247620813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682176 (or 682165 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 247620813 is about 15735.9719432897. The cubic root of 247620813 is about 627.9557599639.

The spelling of 247620813 in words is "two hundred forty-seven million, six hundred twenty thousand, eight hundred thirteen".