75408979 has 2 divisors, whose sum is σ = 75408980. Its totient is φ = 75408978.

The previous prime is 75408953. The next prime is 75408989. The reversal of 75408979 is 97980457.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75408979 is a prime.

It is a super-2 number, since 2×75408979² = 11373028227644882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75408989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37704489 + 37704490.

It is an arithmetic number, because the mean of its divisors is an integer number (37704490).

Almost surely, 2^75408979 is an apocalyptic number.

75408979 is a deficient number, since it is larger than the sum of its proper divisors (1).

75408979 is an equidigital number, since it uses as much as digits as its factorization.

75408979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 49.

The square root of 75408979 is about 8683.8343489498. The cubic root of 75408979 is about 422.4814907336.

The spelling of 75408979 in words is "seventy-five million, four hundred eight thousand, nine hundred seventy-nine".