77645051 has 4 divisors (see below), whose sum is σ = 84703704. Its totient is φ = 70586400.

The previous prime is 77645017. The next prime is 77645059. The reversal of 77645051 is 15054677.

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 77645051 - 2¹⁰ = 77644027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77645059) 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, 3529310 + ... + 3529331.

It is an arithmetic number, because the mean of its divisors is an integer number (21175926).

Almost surely, 2^77645051 is an apocalyptic number.

77645051 is a deficient number, since it is larger than the sum of its proper divisors (7058653).

77645051 is a wasteful number, since it uses less digits than its factorization.

77645051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058652.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 77645051 is about 8811.6429228606. The cubic root of 77645051 is about 426.6167732050.

The spelling of 77645051 in words is "seventy-seven million, six hundred forty-five thousand, fifty-one".