78752261 has 12 divisors (see below), whose sum is σ = 91765440. Its totient is φ = 67387320.

The previous prime is 78752251. The next prime is 78752287. The reversal of 78752261 is 16225787.

It is not a de Polignac number, because 78752261 - 2²⁶ = 11643397 is a prime.

It is a super-2 number, since 2×78752261² = 12403837225224242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78752231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41156 + ... + 43026.

It is an arithmetic number, because the mean of its divisors is an integer number (7647120).

Almost surely, 2^78752261 is an apocalyptic number.

It is an amenable number.

78752261 is a deficient number, since it is larger than the sum of its proper divisors (13013179).

78752261 is a wasteful number, since it uses less digits than its factorization.

78752261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2744 (or 2737 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 78752261 is about 8874.2470666530. The cubic root of 78752261 is about 428.6350462333.

The spelling of 78752261 in words is "seventy-eight million, seven hundred fifty-two thousand, two hundred sixty-one".