77879401 has 2 divisors, whose sum is σ = 77879402. Its totient is φ = 77879400.

The previous prime is 77879353. The next prime is 77879411. The reversal of 77879401 is 10497877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54405376 + 23474025 = 7376^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 77879401 - 2⁷ = 77879273 is a prime.

It is a super-2 number, since 2×77879401² = 12130402200237602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77879411) 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, 38939700 + 38939701.

It is an arithmetic number, because the mean of its divisors is an integer number (38939701).

Almost surely, 2^77879401 is an apocalyptic number.

It is an amenable number.

77879401 is a deficient number, since it is larger than the sum of its proper divisors (1).

77879401 is an equidigital number, since it uses as much as digits as its factorization.

77879401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 77879401 is about 8824.9306512856. The cubic root of 77879401 is about 427.0455501540.

The spelling of 77879401 in words is "seventy-seven million, eight hundred seventy-nine thousand, four hundred one".