77500427 has 2 divisors, whose sum is σ = 77500428. Its totient is φ = 77500426.

The previous prime is 77500361. The next prime is 77500447. The reversal of 77500427 is 72400577.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77500427 - 2¹⁶ = 77434891 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 77500393 and 77500402.

It is not a weakly prime, because it can be changed into another prime (77500447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38750213 + 38750214.

It is an arithmetic number, because the mean of its divisors is an integer number (38750214).

Almost surely, 2^77500427 is an apocalyptic number.

77500427 is a deficient number, since it is larger than the sum of its proper divisors (1).

77500427 is an equidigital number, since it uses as much as digits as its factorization.

77500427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13720, while the sum is 32.

The square root of 77500427 is about 8803.4326827664. The cubic root of 77500427 is about 426.3517321814.

The spelling of 77500427 in words is "seventy-seven million, five hundred thousand, four hundred twenty-seven".