74789721 has 24 divisors (see below), whose sum is σ = 114593856. Its totient is φ = 46902240.

The previous prime is 74789713. The next prime is 74789747. The reversal of 74789721 is 12798747.

It is a happy number.

It is not a de Polignac number, because 74789721 - 2³ = 74789713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74789711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9666 + ... + 15588.

It is an arithmetic number, because the mean of its divisors is an integer number (4774744).

Almost surely, 2^74789721 is an apocalyptic number.

It is an amenable number.

74789721 is a deficient number, since it is larger than the sum of its proper divisors (39804135).

74789721 is a wasteful number, since it uses less digits than its factorization.

74789721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013 (or 6010 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 74789721 is about 8648.1050525534. The cubic root of 74789721 is about 421.3218388988.

The spelling of 74789721 in words is "seventy-four million, seven hundred eighty-nine thousand, seven hundred twenty-one".