76388981 has 4 divisors (see below), whose sum is σ = 76554432. Its totient is φ = 76223532.

The previous prime is 76388969. The next prime is 76388993. The reversal of 76388981 is 18988367.

It is a happy number.

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 (76388969) and next prime (76388993).

It is a cyclic number.

It is not a de Polignac number, because 76388981 - 2¹⁰ = 76387957 is a prime.

It is a super-2 number, since 2×76388981² = 11670552836436722, 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 (76388281) 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, 82031 + ... + 82956.

It is an arithmetic number, because the mean of its divisors is an integer number (19138608).

Almost surely, 2^76388981 is an apocalyptic number.

It is an amenable number.

76388981 is a deficient number, since it is larger than the sum of its proper divisors (165451).

76388981 is a wasteful number, since it uses less digits than its factorization.

76388981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165450.

The product of its digits is 580608, while the sum is 50.

The square root of 76388981 is about 8740.0790042196. The cubic root of 76388981 is about 424.3037846826.

The spelling of 76388981 in words is "seventy-six million, three hundred eighty-eight thousand, nine hundred eighty-one".