78571397 has 4 divisors (see below), whose sum is σ = 78785856. Its totient is φ = 78356940.

The previous prime is 78571393. The next prime is 78571439. The reversal of 78571397 is 79317587.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78571397 - 2² = 78571393 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78571393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106679 + ... + 107412.

It is an arithmetic number, because the mean of its divisors is an integer number (19696464).

Almost surely, 2^78571397 is an apocalyptic number.

It is an amenable number.

78571397 is a deficient number, since it is larger than the sum of its proper divisors (214459).

78571397 is a wasteful number, since it uses less digits than its factorization.

78571397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214458.

The product of its digits is 370440, while the sum is 47.

The square root of 78571397 is about 8864.0508234103. The cubic root of 78571397 is about 428.3066574689.

The spelling of 78571397 in words is "seventy-eight million, five hundred seventy-one thousand, three hundred ninety-seven".