74939990 has 24 divisors (see below), whose sum is σ = 142372080. Its totient is φ = 28396944.

The previous prime is 74939987. The next prime is 74939993. The reversal of 74939990 is 9993947.

It is an interprime number because it is at equal distance from previous prime (74939987) and next prime (74939993).

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74939993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6770 + ... + 13989.

It is an arithmetic number, because the mean of its divisors is an integer number (5932170).

Almost surely, 2^74939990 is an apocalyptic number.

74939990 is a deficient number, since it is larger than the sum of its proper divisors (67432090).

74939990 is a wasteful number, since it uses less digits than its factorization.

74939990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20804 (or 20785 counting only the distinct ones).

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 74939990 is about 8656.7886655503. The cubic root of 74939990 is about 421.6038262072.

The spelling of 74939990 in words is "seventy-four million, nine hundred thirty-nine thousand, nine hundred ninety".