76861381 has 4 divisors (see below), whose sum is σ = 77607712. Its totient is φ = 76115052.

The previous prime is 76861363. The next prime is 76861399. The reversal of 76861381 is 18316867.

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 an interprime number because it is at equal distance from previous prime (76861363) and next prime (76861399).

It is a cyclic number.

It is not a de Polignac number, because 76861381 - 2⁹ = 76860869 is a prime.

It is a super-2 number, since 2×76861381² = 11815343778454322, 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 (76868381) 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, 373011 + ... + 373216.

It is an arithmetic number, because the mean of its divisors is an integer number (19401928).

Almost surely, 2^76861381 is an apocalyptic number.

It is an amenable number.

76861381 is a deficient number, since it is larger than the sum of its proper divisors (746331).

76861381 is a wasteful number, since it uses less digits than its factorization.

76861381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746330.

The product of its digits is 48384, while the sum is 40.

The square root of 76861381 is about 8767.0622787796. The cubic root of 76861381 is about 425.1766389164.

The spelling of 76861381 in words is "seventy-six million, eight hundred sixty-one thousand, three hundred eighty-one".