77530823 has 2 divisors, whose sum is σ = 77530824. Its totient is φ = 77530822.

The previous prime is 77530819. The next prime is 77530841. The reversal of 77530823 is 32803577.

It is a weak prime.

It is an emirp because it is prime and its reverse (32803577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77530823 - 2² = 77530819 is a prime.

It is a super-2 number, since 2×77530823² = 12022057030114658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77530813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38765411 + 38765412.

It is an arithmetic number, because the mean of its divisors is an integer number (38765412).

Almost surely, 2^77530823 is an apocalyptic number.

77530823 is a deficient number, since it is larger than the sum of its proper divisors (1).

77530823 is an equidigital number, since it uses as much as digits as its factorization.

77530823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 77530823 is about 8805.1588855625. The cubic root of 77530823 is about 426.4074638888.

The spelling of 77530823 in words is "seventy-seven million, five hundred thirty thousand, eight hundred twenty-three".