74640457 has 2 divisors, whose sum is σ = 74640458. Its totient is φ = 74640456.

The previous prime is 74640443. The next prime is 74640481. The reversal of 74640457 is 75404647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59305401 + 15335056 = 7701^2 + 3916^2 .

It is an emirp because it is prime and its reverse (75404647) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74640457 is a prime.

It is not a weakly prime, because it can be changed into another prime (74640407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37320228 + 37320229.

It is an arithmetic number, because the mean of its divisors is an integer number (37320229).

Almost surely, 2^74640457 is an apocalyptic number.

It is an amenable number.

74640457 is a deficient number, since it is larger than the sum of its proper divisors (1).

74640457 is an equidigital number, since it uses as much as digits as its factorization.

74640457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 74640457 is about 8639.4708750015. The cubic root of 74640457 is about 421.0413633396.

It can be divided in two parts, 7 and 4640457, that added together give a palindrome (4640464).

The spelling of 74640457 in words is "seventy-four million, six hundred forty thousand, four hundred fifty-seven".