78457197 has 32 divisors (see below), whose sum is σ = 130959360. Its totient is φ = 40674240.

The previous prime is 78457177. The next prime is 78457207. The reversal of 78457197 is 79175487.

It is not a de Polignac number, because 78457197 - 2⁶ = 78457133 is a prime.

It is a super-2 number, since 2×78457197² = 12311063522193618, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78457157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13672 + ... + 18542.

It is an arithmetic number, because the mean of its divisors is an integer number (4092480).

Almost surely, 2^78457197 is an apocalyptic number.

It is an amenable number.

78457197 is a deficient number, since it is larger than the sum of its proper divisors (52502163).

78457197 is a wasteful number, since it uses less digits than its factorization.

78457197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4953.

The product of its digits is 493920, while the sum is 48.

The square root of 78457197 is about 8857.6067309404. The cubic root of 78457197 is about 428.0990486836.

The spelling of 78457197 in words is "seventy-eight million, four hundred fifty-seven thousand, one hundred ninety-seven".