78722688 has 64 divisors (see below), whose sum is σ = 228129120. Its totient is φ = 23854080.

The previous prime is 78722687. The next prime is 78722731. The reversal of 78722688 is 88622787.

It is a tau number, because it is divible by the number of its divisors (64).

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

It is not an unprimeable number, because it can be changed into a prime (78722687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5095 + ... + 13542.

Almost surely, 2^78722688 is an apocalyptic number.

It is an amenable number.

78722688 is an abundant number, since it is smaller than the sum of its proper divisors (149406432).

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

78722688 is a wasteful number, since it uses less digits than its factorization.

78722688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18665 (or 18653 counting only the distinct ones).

The product of its digits is 602112, while the sum is 48.

The square root of 78722688 is about 8872.5806843331. The cubic root of 78722688 is about 428.5813859274.

Subtracting 78722688 from its reverse (88622787), we obtain a palindrome (9900099).

The spelling of 78722688 in words is "seventy-eight million, seven hundred twenty-two thousand, six hundred eighty-eight".