74531821 has 8 divisors (see below), whose sum is σ = 91731584. Its totient is φ = 58970160.

The previous prime is 74531797. The next prime is 74531861. The reversal of 74531821 is 12813547.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74531821 - 2⁹ = 74531309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74531861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409425 + ... + 409606.

It is an arithmetic number, because the mean of its divisors is an integer number (11466448).

Almost surely, 2^74531821 is an apocalyptic number.

It is an amenable number.

74531821 is a deficient number, since it is larger than the sum of its proper divisors (17199763).

74531821 is a wasteful number, since it uses less digits than its factorization.

74531821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819051.

The product of its digits is 6720, while the sum is 31.

The square root of 74531821 is about 8633.1813950594. The cubic root of 74531821 is about 420.8369949120.

The spelling of 74531821 in words is "seventy-four million, five hundred thirty-one thousand, eight hundred twenty-one".