77620919 has 4 divisors (see below), whose sum is σ = 77644944. Its totient is φ = 77596896.

The previous prime is 77620889. The next prime is 77620951. The reversal of 77620919 is 91902677.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77620919 - 2²⁰ = 76572343 is a prime.

It is a super-2 number, since 2×77620919² = 12050014132809122, 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 (77620969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6242 + ... + 13935.

It is an arithmetic number, because the mean of its divisors is an integer number (19411236).

Almost surely, 2^77620919 is an apocalyptic number.

77620919 is a deficient number, since it is larger than the sum of its proper divisors (24025).

77620919 is a wasteful number, since it uses less digits than its factorization.

77620919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24024.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 77620919 is about 8810.2734917822. The cubic root of 77620919 is about 426.5725712776.

The spelling of 77620919 in words is "seventy-seven million, six hundred twenty thousand, nine hundred nineteen".