77427919 has 2 divisors, whose sum is σ = 77427920. Its totient is φ = 77427918.

The previous prime is 77427901. The next prime is 77427929. The reversal of 77427919 is 91972477.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77427919 - 2²¹ = 75330767 is a prime.

It is a super-2 number, since 2×77427919² = 11990165281341122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77427929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38713959 + 38713960.

It is an arithmetic number, because the mean of its divisors is an integer number (38713960).

Almost surely, 2^77427919 is an apocalyptic number.

77427919 is a deficient number, since it is larger than the sum of its proper divisors (1).

77427919 is an equidigital number, since it uses as much as digits as its factorization.

77427919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264, while the sum is 46.

The square root of 77427919 is about 8799.3135527722. The cubic root of 77427919 is about 426.2187283669.

The spelling of 77427919 in words is "seventy-seven million, four hundred twenty-seven thousand, nine hundred nineteen".