78314257 has 24 divisors (see below), whose sum is σ = 100071936. Its totient is φ = 59819904.

The previous prime is 78314233. The next prime is 78314279. The reversal of 78314257 is 75241387.

It is a de Polignac number, because none of the positive numbers 2^k-78314257 is a prime.

It is a super-2 number, since 2×78314257² = 12266245698924098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78314227) 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, 42048 + ... + 43870.

It is an arithmetic number, because the mean of its divisors is an integer number (4169664).

Almost surely, 2^78314257 is an apocalyptic number.

It is an amenable number.

78314257 is a deficient number, since it is larger than the sum of its proper divisors (21757679).

78314257 is a wasteful number, since it uses less digits than its factorization.

78314257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1885 (or 1866 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 78314257 is about 8849.5342815314. The cubic root of 78314257 is about 427.8389082082.

The spelling of 78314257 in words is "seventy-eight million, three hundred fourteen thousand, two hundred fifty-seven".