74640909 has 16 divisors (see below), whose sum is σ = 113861120. Its totient is φ = 42606000.

The previous prime is 74640899. The next prime is 74640941. The reversal of 74640909 is 90904647.

It is not a de Polignac number, because 74640909 - 2¹² = 74636813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74640989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32034 + ... + 34284.

It is an arithmetic number, because the mean of its divisors is an integer number (7116320).

Almost surely, 2^74640909 is an apocalyptic number.

It is an amenable number.

74640909 is a deficient number, since it is larger than the sum of its proper divisors (39220211).

74640909 is a wasteful number, since it uses less digits than its factorization.

74640909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3840.

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 74640909 is about 8639.4970339714. The cubic root of 74640909 is about 421.0422132376.

The spelling of 74640909 in words is "seventy-four million, six hundred forty thousand, nine hundred nine".