7940728 has 8 divisors (see below), whose sum is σ = 14888880. Its totient is φ = 3970360.

The previous prime is 7940719. The next prime is 7940747. The reversal of 7940728 is 8270497.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×7940728² = 126110322339968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496288 + ... + 496303.

It is an arithmetic number, because the mean of its divisors is an integer number (1861110).

Almost surely, 2^7940728 is an apocalyptic number.

It is an amenable number.

7940728 is a deficient number, since it is larger than the sum of its proper divisors (6948152).

7940728 is a wasteful number, since it uses less digits than its factorization.

7940728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992597 (or 992593 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 7940728 is about 2817.9297365264. The cubic root of 7940728 is about 199.5048417700.

It can be divided in two parts, 7940 and 728, that added together give a palindrome (8668).

The spelling of 7940728 in words is "seven million, nine hundred forty thousand, seven hundred twenty-eight".