74818721 has 2 divisors, whose sum is σ = 74818722. Its totient is φ = 74818720.

The previous prime is 74818687. The next prime is 74818729. The reversal of 74818721 is 12781847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72063121 + 2755600 = 8489^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 74818721 - 2¹⁴ = 74802337 is a prime.

It is not a weakly prime, because it can be changed into another prime (74818729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37409360 + 37409361.

It is an arithmetic number, because the mean of its divisors is an integer number (37409361).

Almost surely, 2^74818721 is an apocalyptic number.

It is an amenable number.

74818721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74818721 is an equidigital number, since it uses as much as digits as its factorization.

74818721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The square root of 74818721 is about 8649.7815579354. The cubic root of 74818721 is about 421.3762882459.

The spelling of 74818721 in words is "seventy-four million, eight hundred eighteen thousand, seven hundred twenty-one".