78016257 has 16 divisors (see below), whose sum is σ = 126087360. Its totient is φ = 47282400.

The previous prime is 78016241. The next prime is 78016271. The reversal of 78016257 is 75261087.

It is not a de Polignac number, because 78016257 - 2⁴ = 78016241 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (78016297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131044 + ... + 131637.

It is an arithmetic number, because the mean of its divisors is an integer number (7880460).

Almost surely, 2^78016257 is an apocalyptic number.

It is an amenable number.

78016257 is a deficient number, since it is larger than the sum of its proper divisors (48071103).

78016257 is a wasteful number, since it uses less digits than its factorization.

78016257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262701 (or 262695 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 78016257 is about 8832.6811897634. The cubic root of 78016257 is about 427.2955501301.

The spelling of 78016257 in words is "seventy-eight million, sixteen thousand, two hundred fifty-seven".