77969623 has 2 divisors, whose sum is σ = 77969624. Its totient is φ = 77969622.

The previous prime is 77969611. The next prime is 77969627. The reversal of 77969623 is 32696977.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77969623 - 2¹³ = 77961431 is a prime.

It is a super-2 number, since 2×77969623² = 12158524221524258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77969627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38984811 + 38984812.

It is an arithmetic number, because the mean of its divisors is an integer number (38984812).

Almost surely, 2^77969623 is an apocalyptic number.

77969623 is a deficient number, since it is larger than the sum of its proper divisors (1).

77969623 is an equidigital number, since it uses as much as digits as its factorization.

77969623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 49.

The square root of 77969623 is about 8830.0409398824. The cubic root of 77969623 is about 427.2103949196.

The spelling of 77969623 in words is "seventy-seven million, nine hundred sixty-nine thousand, six hundred twenty-three".