28340725 has 12 divisors (see below), whose sum is σ = 40163104. Its totient is φ = 19433520.

The previous prime is 28340681. The next prime is 28340749. The reversal of 28340725 is 52704382.

It is not a de Polignac number, because 28340725 - 2⁷ = 28340597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80799 + ... + 81148.

Almost surely, 2^28340725 is an apocalyptic number.

28340725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28340725 is a deficient number, since it is larger than the sum of its proper divisors (11822379).

28340725 is a wasteful number, since it uses less digits than its factorization.

28340725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161964 (or 161959 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 28340725 is about 5323.6007551281. The cubic root of 28340725 is about 304.8856509441.

The spelling of 28340725 in words is "twenty-eight million, three hundred forty thousand, seven hundred twenty-five".