7140728 has 32 divisors (see below), whose sum is σ = 15832800. Its totient is φ = 2954112.

The previous prime is 7140701. The next prime is 7140733. The reversal of 7140728 is 8270417.

7140728 = 1007² + 1008² + ... + 1013².

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 7140728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575 + ... + 3822.

It is an arithmetic number, because the mean of its divisors is an integer number (494775).

Almost surely, 2^7140728 is an apocalyptic number.

It is an amenable number.

7140728 is an abundant number, since it is smaller than the sum of its proper divisors (8692072).

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

7140728 is a wasteful number, since it uses less digits than its factorization.

7140728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4439 (or 4435 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 7140728 is about 2672.2140632816. The cubic root of 7140728 is about 192.5665413408.

It can be divided in two parts, 71407 and 28, that multiplied together give a square (1999396 = 1414²).

The spelling of 7140728 in words is "seven million, one hundred forty thousand, seven hundred twenty-eight".