78888249 has 36 divisors (see below), whose sum is σ = 129937808. Its totient is φ = 47793240.

The previous prime is 78888241. The next prime is 78888283. The reversal of 78888249 is 94288887.

It is not a de Polignac number, because 78888249 - 2³ = 78888241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78888195 and 78888204.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 28062 + ... + 30744.

Almost surely, 2^78888249 is an apocalyptic number.

It is an amenable number.

78888249 is a deficient number, since it is larger than the sum of its proper divisors (51049559).

78888249 is a wasteful number, since it uses less digits than its factorization.

78888249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720 (or 2697 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 78888249 is about 8881.9057076733. The cubic root of 78888249 is about 428.8816241438.

The spelling of 78888249 in words is "seventy-eight million, eight hundred eighty-eight thousand, two hundred forty-nine".