77434431 has 16 divisors (see below), whose sum is σ = 105560064. Its totient is φ = 50472864.

The previous prime is 77434429. The next prime is 77434447. The reversal of 77434431 is 13443477.

It is not a de Polignac number, because 77434431 - 2¹ = 77434429 is a prime.

It is a super-2 number, since 2×77434431² = 11992182208587522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77434392 and 77434401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77434411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57690 + ... + 59016.

It is an arithmetic number, because the mean of its divisors is an integer number (6597504).

Almost surely, 2^77434431 is an apocalyptic number.

77434431 is a deficient number, since it is larger than the sum of its proper divisors (28125633).

77434431 is a wasteful number, since it uses less digits than its factorization.

77434431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750.

The product of its digits is 28224, while the sum is 33.

The square root of 77434431 is about 8799.6835738565. The cubic root of 77434431 is about 426.2306769361.

The spelling of 77434431 in words is "seventy-seven million, four hundred thirty-four thousand, four hundred thirty-one".