78371397 has 48 divisors (see below), whose sum is σ = 126380800. Its totient is φ = 46500480.

The previous prime is 78371393. The next prime is 78371407. The reversal of 78371397 is 79317387.

It is not a de Polignac number, because 78371397 - 2² = 78371393 is a prime.

It is a super-2 number, since 2×78371397² = 12284151735463218, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78371393) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 563754 + ... + 563892.

Almost surely, 2^78371397 is an apocalyptic number.

It is an amenable number.

78371397 is a deficient number, since it is larger than the sum of its proper divisors (48009403).

78371397 is a wasteful number, since it uses less digits than its factorization.

78371397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 295 counting only the distinct ones).

The product of its digits is 222264, while the sum is 45.

The square root of 78371397 is about 8852.7621113413. The cubic root of 78371397 is about 427.9429368271.

The spelling of 78371397 in words is "seventy-eight million, three hundred seventy-one thousand, three hundred ninety-seven".