77443440431 has 32 divisors (see below), whose sum is σ = 95163763200. Its totient is φ = 61550461440.

The previous prime is 77443440413. The next prime is 77443440433. The reversal of 77443440431 is 13404434477.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77443440431 is a prime.

It is a super-2 number, since 2×77443440431² (a number of 23 digits) 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 (77443440433) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1241435 + ... + 1302323.

It is an arithmetic number, because the mean of its divisors is an integer number (2973867600).

Almost surely, 2^77443440431 is an apocalyptic number.

77443440431 is a deficient number, since it is larger than the sum of its proper divisors (17720322769).

77443440431 is a wasteful number, since it uses less digits than its factorization.

77443440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61119.

The product of its (nonzero) digits is 451584, while the sum is 41.

The spelling of 77443440431 in words is "seventy-seven billion, four hundred forty-three million, four hundred forty thousand, four hundred thirty-one".