78888251 has 16 divisors (see below), whose sum is σ = 87064320. Its totient is φ = 71033760.

The previous prime is 78888241. The next prime is 78888283. The reversal of 78888251 is 15288887.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78888251 is a prime.

It is a super-2 number, since 2×78888251² = 12446712291678002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78888196 and 78888205.

It is not an unprimeable number, because it can be changed into a prime (78888241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124706 + ... + 125336.

It is an arithmetic number, because the mean of its divisors is an integer number (5441520).

Almost surely, 2^78888251 is an apocalyptic number.

78888251 is a deficient number, since it is larger than the sum of its proper divisors (8176069).

78888251 is a wasteful number, since it uses less digits than its factorization.

78888251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866.

The product of its digits is 286720, while the sum is 47.

The square root of 78888251 is about 8881.9058202618. The cubic root of 78888251 is about 428.8816277681.

The spelling of 78888251 in words is "seventy-eight million, eight hundred eighty-eight thousand, two hundred fifty-one".