74627809 has 2 divisors, whose sum is σ = 74627810. Its totient is φ = 74627808.

The previous prime is 74627797. The next prime is 74627851. The reversal of 74627809 is 90872647.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37454400 + 37173409 = 6120^2 + 6097^2 .

It is a cyclic number.

It is not a de Polignac number, because 74627809 - 2¹⁹ = 74103521 is a prime.

It is a super-2 number, since 2×74627809² = 11138619752280962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74627879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37313904 + 37313905.

It is an arithmetic number, because the mean of its divisors is an integer number (37313905).

Almost surely, 2^74627809 is an apocalyptic number.

It is an amenable number.

74627809 is a deficient number, since it is larger than the sum of its proper divisors (1).

74627809 is an equidigital number, since it uses as much as digits as its factorization.

74627809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 74627809 is about 8638.7388547172. The cubic root of 74627809 is about 421.0175798483.

The spelling of 74627809 in words is "seventy-four million, six hundred twenty-seven thousand, eight hundred nine".