78131797 has 8 divisors (see below), whose sum is σ = 79183872. Its totient is φ = 77086800.

The previous prime is 78131791. The next prime is 78131821. The reversal of 78131797 is 79713187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78131797 is a prime.

It is a super-2 number, since 2×78131797² = 12209155404898418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78131791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22647 + ... + 25867.

It is an arithmetic number, because the mean of its divisors is an integer number (9897984).

Almost surely, 2^78131797 is an apocalyptic number.

It is an amenable number.

78131797 is a deficient number, since it is larger than the sum of its proper divisors (1052075).

78131797 is a wasteful number, since it uses less digits than its factorization.

78131797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539.

The product of its digits is 74088, while the sum is 43.

The square root of 78131797 is about 8839.2192528526. The cubic root of 78131797 is about 427.5063838633.

The spelling of 78131797 in words is "seventy-eight million, one hundred thirty-one thousand, seven hundred ninety-seven".