77006431 has 2 divisors, whose sum is σ = 77006432. Its totient is φ = 77006430.

The previous prime is 77006407. The next prime is 77006441. The reversal of 77006431 is 13460077.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77006431 - 2¹¹ = 77004383 is a prime.

It is a super-2 number, since 2×77006431² = 11859980830715522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77006431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77006401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38503215 + 38503216.

It is an arithmetic number, because the mean of its divisors is an integer number (38503216).

Almost surely, 2^77006431 is an apocalyptic number.

77006431 is a deficient number, since it is larger than the sum of its proper divisors (1).

77006431 is an equidigital number, since it uses as much as digits as its factorization.

77006431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 77006431 is about 8775.3308199748. The cubic root of 77006431 is about 425.4439301374.

The spelling of 77006431 in words is "seventy-seven million, six thousand, four hundred thirty-one".