74574573906 has 128 divisors (see below), whose sum is σ = 180808151040. Its totient is φ = 20030976000.

The previous prime is 74574573901. The next prime is 74574573907. The reversal of 74574573906 is 60937547547.

It is a super-2 number, since 2×74574573906² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (74574573901) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77119035 + ... + 77120001.

It is an arithmetic number, because the mean of its divisors is an integer number (1412563680).

Almost surely, 2^74574573906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74574573906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90404075520).

74574573906 is an abundant number, since it is smaller than the sum of its proper divisors (106233577134).

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

74574573906 is a wasteful number, since it uses less digits than its factorization.

74574573906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640.

The product of its (nonzero) digits is 22226400, while the sum is 57.

The spelling of 74574573906 in words is "seventy-four billion, five hundred seventy-four million, five hundred seventy-three thousand, nine hundred six".