74878369 has 2 divisors, whose sum is σ = 74878370. Its totient is φ = 74878368.

The previous prime is 74878339. The next prime is 74878393. The reversal of 74878369 is 96387847.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62204769 + 12673600 = 7887^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 74878369 - 2⁵ = 74878337 is a prime.

It is a super-2 number, since 2×74878369² = 11213540288200322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74878339) 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, 37439184 + 37439185.

It is an arithmetic number, because the mean of its divisors is an integer number (37439185).

Almost surely, 2^74878369 is an apocalyptic number.

It is an amenable number.

74878369 is a deficient number, since it is larger than the sum of its proper divisors (1).

74878369 is an equidigital number, since it uses as much as digits as its factorization.

74878369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 74878369 is about 8653.2288193483. The cubic root of 74878369 is about 421.4882369497.

The spelling of 74878369 in words is "seventy-four million, eight hundred seventy-eight thousand, three hundred sixty-nine".