76728868621765 has 16 divisors (see below), whose sum is σ = 92095489946880. Its totient is φ = 61369197926400.

The previous prime is 76728868621759. The next prime is 76728868621787. The reversal of 76728868621765 is 56712686882767.

It is not a de Polignac number, because 76728868621765 - 2⁷ = 76728868621637 is a prime.

It is a super-2 number, since 2×76728868621765² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487996792 + ... + 488153998.

It is an arithmetic number, because the mean of its divisors is an integer number (5755968121680).

Almost surely, 2^{76728868621765} is an apocalyptic number.

It is an amenable number.

76728868621765 is a deficient number, since it is larger than the sum of its proper divisors (15366621325115).

76728868621765 is a wasteful number, since it uses less digits than its factorization.

76728868621765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178692.

The product of its digits is 4551966720, while the sum is 79.

The spelling of 76728868621765 in words is "seventy-six trillion, seven hundred twenty-eight billion, eight hundred sixty-eight million, six hundred twenty-one thousand, seven hundred sixty-five".