1247808864 has 48 divisors (see below), whose sum is σ = 3294475632. Its totient is φ = 413526528.

The previous prime is 1247808853. The next prime is 1247808893. The reversal of 1247808864 is 4688087421.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×1247808864² = 3114053922153940992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20959 + ... + 54174.

It is an arithmetic number, because the mean of its divisors is an integer number (68634909).

Almost surely, 2^1247808864 is an apocalyptic number.

It is an amenable number.

1247808864 is an abundant number, since it is smaller than the sum of its proper divisors (2046666768).

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

1247808864 is a wasteful number, since it uses less digits than its factorization.

1247808864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75319 (or 75311 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The square root of 1247808864 is about 35324.3381254341. The cubic root of 1247808864 is about 1076.5875556302.

The spelling of 1247808864 in words is "one billion, two hundred forty-seven million, eight hundred eight thousand, eight hundred sixty-four".