7172428 has 6 divisors (see below), whose sum is σ = 12551756. Its totient is φ = 3586212.

The previous prime is 7172423. The next prime is 7172447. The reversal of 7172428 is 8242717.

It is a self number, because there is not a number n which added to its sum of digits gives 7172428.

It is not an unprimeable number, because it can be changed into a prime (7172423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 896550 + ... + 896557.

Almost surely, 2^7172428 is an apocalyptic number.

It is an amenable number.

7172428 is a deficient number, since it is larger than the sum of its proper divisors (5379328).

7172428 is a wasteful number, since it uses less digits than its factorization.

7172428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793111 (or 1793109 counting only the distinct ones).

The product of its digits is 6272, while the sum is 31.

The square root of 7172428 is about 2678.1389060316. The cubic root of 7172428 is about 192.8510757514.

The spelling of 7172428 in words is "seven million, one hundred seventy-two thousand, four hundred twenty-eight".