74731820 has 12 divisors (see below), whose sum is σ = 156936864. Its totient is φ = 29892720.

The previous prime is 74731781. The next prime is 74731829. The reversal of 74731820 is 2813747.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (74731829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1868276 + ... + 1868315.

It is an arithmetic number, because the mean of its divisors is an integer number (13078072).

Almost surely, 2^74731820 is an apocalyptic number.

It is an amenable number.

74731820 is an abundant number, since it is smaller than the sum of its proper divisors (82205044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

74731820 is a wasteful number, since it uses less digits than its factorization.

74731820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736600 (or 3736598 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 74731820 is about 8644.7567924147. The cubic root of 74731820 is about 421.2130839631.

The spelling of 74731820 in words is "seventy-four million, seven hundred thirty-one thousand, eight hundred twenty".