77893631 has 2 divisors, whose sum is σ = 77893632. Its totient is φ = 77893630.

The previous prime is 77893579. The next prime is 77893633. The reversal of 77893631 is 13639877.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77893631 - 2¹⁸ = 77631487 is a prime.

It is a super-2 number, since 2×77893631² = 12134835500728322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 77893633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77893633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38946815 + 38946816.

It is an arithmetic number, because the mean of its divisors is an integer number (38946816).

Almost surely, 2^77893631 is an apocalyptic number.

77893631 is a deficient number, since it is larger than the sum of its proper divisors (1).

77893631 is an equidigital number, since it uses as much as digits as its factorization.

77893631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 44.

The square root of 77893631 is about 8825.7368530905. The cubic root of 77893631 is about 427.0715582640.

The spelling of 77893631 in words is "seventy-seven million, eight hundred ninety-three thousand, six hundred thirty-one".