77126645 has 4 divisors (see below), whose sum is σ = 92551980. Its totient is φ = 61701312.

The previous prime is 77126633. The next prime is 77126653. The reversal of 77126645 is 54662177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54662177 = 1741 ⋅31397.

It can be written as a sum of positive squares in 2 ways, for example, as 45508516 + 31618129 = 6746^2 + 5623^2 .

It is a cyclic number.

It is not a de Polignac number, because 77126645 - 2¹⁴ = 77110261 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77126599 and 77126608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7712660 + ... + 7712669.

It is an arithmetic number, because the mean of its divisors is an integer number (23137995).

Almost surely, 2^77126645 is an apocalyptic number.

It is an amenable number.

77126645 is a deficient number, since it is larger than the sum of its proper divisors (15425335).

77126645 is a wasteful number, since it uses less digits than its factorization.

77126645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15425334.

The product of its digits is 70560, while the sum is 38.

The square root of 77126645 is about 8782.1776912108. The cubic root of 77126645 is about 425.6652005143.

The spelling of 77126645 in words is "seventy-seven million, one hundred twenty-six thousand, six hundred forty-five".