76990387 has 4 divisors (see below), whose sum is σ = 77009400. Its totient is φ = 76971376.

The previous prime is 76990379. The next prime is 76990393. The reversal of 76990387 is 78309967.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78309967 = 4951 ⋅15817.

It is a cyclic number.

It is not a de Polignac number, because 76990387 - 2³ = 76990379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 76990387.

It is not an unprimeable number, because it can be changed into a prime (76990327) 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, 733 + ... + 12430.

It is an arithmetic number, because the mean of its divisors is an integer number (19252350).

Almost surely, 2^76990387 is an apocalyptic number.

76990387 is a deficient number, since it is larger than the sum of its proper divisors (19013).

76990387 is a wasteful number, since it uses less digits than its factorization.

76990387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19012.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 76990387 is about 8774.4166187844. The cubic root of 76990387 is about 425.4143815381.

It can be divided in two parts, 76990 and 387, that added together give a palindrome (77377).

The spelling of 76990387 in words is "seventy-six million, nine hundred ninety thousand, three hundred eighty-seven".