77690143 has 2 divisors, whose sum is σ = 77690144. Its totient is φ = 77690142.

The previous prime is 77690131. The next prime is 77690191. The reversal of 77690143 is 34109677.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77690143 - 2²⁵ = 44135711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77691143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38845071 + 38845072.

It is an arithmetic number, because the mean of its divisors is an integer number (38845072).

Almost surely, 2^77690143 is an apocalyptic number.

77690143 is a deficient number, since it is larger than the sum of its proper divisors (1).

77690143 is an equidigital number, since it uses as much as digits as its factorization.

77690143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 77690143 is about 8814.2012116811. The cubic root of 77690143 is about 426.6993424546.

The spelling of 77690143 in words is "seventy-seven million, six hundred ninety thousand, one hundred forty-three".