73921657 has 2 divisors, whose sum is σ = 73921658. Its totient is φ = 73921656.

The previous prime is 73921637. The next prime is 73921711. The reversal of 73921657 is 75612937.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64336441 + 9585216 = 8021^2 + 3096^2 .

It is a cyclic number.

It is not a de Polignac number, because 73921657 - 2¹¹ = 73919609 is a prime.

It is a super-2 number, since 2×73921657² = 10928822747251298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73921637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36960828 + 36960829.

It is an arithmetic number, because the mean of its divisors is an integer number (36960829).

Almost surely, 2^73921657 is an apocalyptic number.

It is an amenable number.

73921657 is a deficient number, since it is larger than the sum of its proper divisors (1).

73921657 is an equidigital number, since it uses as much as digits as its factorization.

73921657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 79380, while the sum is 40.

The square root of 73921657 is about 8597.7704668129. The cubic root of 73921657 is about 419.6854352852.

The spelling of 73921657 in words is "seventy-three million, nine hundred twenty-one thousand, six hundred fifty-seven".