247772840 has 128 divisors (see below), whose sum is σ = 661893120. Its totient is φ = 81715200.

The previous prime is 247772803. The next prime is 247772843. The reversal of 247772840 is 48277742.

247772840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×247772840³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (247772843) 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, 1297145 + ... + 1297335.

It is an arithmetic number, because the mean of its divisors is an integer number (5171040).

Almost surely, 2^247772840 is an apocalyptic number.

247772840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247772840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330946560).

247772840 is an abundant number, since it is smaller than the sum of its proper divisors (414120280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

247772840 is a wasteful number, since it uses less digits than its factorization.

247772840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 175616, while the sum is 41.

The square root of 247772840 is about 15740.8017584874. The cubic root of 247772840 is about 628.0842449899.

The spelling of 247772840 in words is "two hundred forty-seven million, seven hundred seventy-two thousand, eight hundred forty".