74991457 has 2 divisors, whose sum is σ = 74991458. Its totient is φ = 74991456.

The previous prime is 74991451. The next prime is 74991481. The reversal of 74991457 is 75419947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70492816 + 4498641 = 8396^2 + 2121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74991457 is a prime.

It is not a weakly prime, because it can be changed into another prime (74991451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37495728 + 37495729.

It is an arithmetic number, because the mean of its divisors is an integer number (37495729).

Almost surely, 2^74991457 is an apocalyptic number.

It is an amenable number.

74991457 is a deficient number, since it is larger than the sum of its proper divisors (1).

74991457 is an equidigital number, since it uses as much as digits as its factorization.

74991457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 46.

The square root of 74991457 is about 8659.7607934631. The cubic root of 74991457 is about 421.7003199423.

The spelling of 74991457 in words is "seventy-four million, nine hundred ninety-one thousand, four hundred fifty-seven".