74645391 has 16 divisors (see below), whose sum is σ = 105746400. Its totient is φ = 46747008.

The previous prime is 74645387. The next prime is 74645399. The reversal of 74645391 is 19354647.

It is not a de Polignac number, because 74645391 - 2² = 74645387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74645399) 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, 8376 + ... + 14813.

It is an arithmetic number, because the mean of its divisors is an integer number (6609150).

Almost surely, 2^74645391 is an apocalyptic number.

74645391 is a deficient number, since it is larger than the sum of its proper divisors (31101009).

74645391 is a wasteful number, since it uses less digits than its factorization.

74645391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23258.

The product of its digits is 90720, while the sum is 39.

The square root of 74645391 is about 8639.7564201776. The cubic root of 74645391 is about 421.0506405797.

The spelling of 74645391 in words is "seventy-four million, six hundred forty-five thousand, three hundred ninety-one".