7921478574 has 12 divisors (see below), whose sum is σ = 17163203616. Its totient is φ = 2640492852.

The previous prime is 7921478479. The next prime is 7921478597. The reversal of 7921478574 is 4758741297.

7921478574 is a `hidden beast` number, since 7 + 9 + 21 + 47 + 8 + 574 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 7921478574.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220041054 + ... + 220041089.

It is an arithmetic number, because the mean of its divisors is an integer number (1430266968).

Almost surely, 2^7921478574 is an apocalyptic number.

7921478574 is an abundant number, since it is smaller than the sum of its proper divisors (9241725042).

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

7921478574 is a wasteful number, since it uses less digits than its factorization.

7921478574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440082151 (or 440082148 counting only the distinct ones).

The product of its digits is 3951360, while the sum is 54.

The square root of 7921478574 is about 89002.6885773683. The cubic root of 7921478574 is about 1993.4350219435.

The spelling of 7921478574 in words is "seven billion, nine hundred twenty-one million, four hundred seventy-eight thousand, five hundred seventy-four".