77690231 has 2 divisors, whose sum is σ = 77690232. Its totient is φ = 77690230.

The previous prime is 77690227. The next prime is 77690257. The reversal of 77690231 is 13209677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77690231 - 2² = 77690227 is a prime.

It is a super-2 number, since 2×77690231² = 12071543985666722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77690191 and 77690200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77690131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38845115 + 38845116.

It is an arithmetic number, because the mean of its divisors is an integer number (38845116).

Almost surely, 2^77690231 is an apocalyptic number.

77690231 is a deficient number, since it is larger than the sum of its proper divisors (1).

77690231 is an equidigital number, since it uses as much as digits as its factorization.

77690231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 77690231 is about 8814.2062036238. The cubic root of 77690231 is about 426.6995035627.

The spelling of 77690231 in words is "seventy-seven million, six hundred ninety thousand, two hundred thirty-one".