78475881 has 24 divisors (see below), whose sum is σ = 117210240. Its totient is φ = 46652320.

The previous prime is 78475877. The next prime is 78475883. The reversal of 78475881 is 18857487.

It is not a de Polignac number, because 78475881 - 2² = 78475877 is a prime.

It is a super-2 number, since 2×78475881² = 12316927797452322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78475881.

It is not an unprimeable number, because it can be changed into a prime (78475883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17200 + ... + 21278.

It is an arithmetic number, because the mean of its divisors is an integer number (4883760).

Almost surely, 2^78475881 is an apocalyptic number.

It is an amenable number.

78475881 is a deficient number, since it is larger than the sum of its proper divisors (38734359).

78475881 is a wasteful number, since it uses less digits than its factorization.

78475881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4157 (or 4146 counting only the distinct ones).

The product of its digits is 501760, while the sum is 48.

The square root of 78475881 is about 8858.6613548549. The cubic root of 78475881 is about 428.1330288583.

The spelling of 78475881 in words is "seventy-eight million, four hundred seventy-five thousand, eight hundred eighty-one".