77620051 has 4 divisors (see below), whose sum is σ = 77653912. Its totient is φ = 77586192.

The previous prime is 77620033. The next prime is 77620057. The reversal of 77620051 is 15002677.

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 77620051 - 2⁷ = 77619923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77620057) 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 3 ways as a sum of consecutive naturals, for example, 13221 + ... + 18166.

It is an arithmetic number, because the mean of its divisors is an integer number (19413478).

Almost surely, 2^77620051 is an apocalyptic number.

77620051 is a deficient number, since it is larger than the sum of its proper divisors (33861).

77620051 is a wasteful number, since it uses less digits than its factorization.

77620051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33860.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 77620051 is about 8810.2242309716. The cubic root of 77620051 is about 426.5709812149.

The spelling of 77620051 in words is "seventy-seven million, six hundred twenty thousand, fifty-one".