78872451 has 32 divisors (see below), whose sum is σ = 127515648. Its totient is φ = 42387840.

The previous prime is 78872447. The next prime is 78872459. The reversal of 78872451 is 15427887.

It is not a de Polignac number, because 78872451 - 2² = 78872447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78872459) 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, 28125 + ... + 30801.

It is an arithmetic number, because the mean of its divisors is an integer number (3984864).

Almost surely, 2^78872451 is an apocalyptic number.

78872451 is a deficient number, since it is larger than the sum of its proper divisors (48643197).

78872451 is a wasteful number, since it uses less digits than its factorization.

78872451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2771.

The product of its digits is 125440, while the sum is 42.

The square root of 78872451 is about 8881.0163269752. The cubic root of 78872451 is about 428.8529932458.

The spelling of 78872451 in words is "seventy-eight million, eight hundred seventy-two thousand, four hundred fifty-one".