7921739428 has 12 divisors (see below), whose sum is σ = 13865367040. Its totient is φ = 3960205992.

The previous prime is 7921739387. The next prime is 7921739443. The reversal of 7921739428 is 8249371297.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138576 + ... + 187207.

Almost surely, 2^7921739428 is an apocalyptic number.

It is an amenable number.

7921739428 is a deficient number, since it is larger than the sum of its proper divisors (5943627612).

7921739428 is a wasteful number, since it uses less digits than its factorization.

7921739428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331866 (or 331864 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 52.

The square root of 7921739428 is about 89004.1539929457. The cubic root of 7921739428 is about 1993.4569029508.

The spelling of 7921739428 in words is "seven billion, nine hundred twenty-one million, seven hundred thirty-nine thousand, four hundred twenty-eight".