28740392 has 32 divisors (see below), whose sum is σ = 56543400. Its totient is φ = 13676544.

The previous prime is 28740389. The next prime is 28740401. The reversal of 28740392 is 29304782.

It can be written as a sum of positive squares in 4 ways, for example, as 28665316 + 75076 = 5354^2 + 274^2 .

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, 16088 + ... + 17784.

Almost surely, 2^28740392 is an apocalyptic number.

It is an amenable number.

28740392 is a deficient number, since it is larger than the sum of its proper divisors (27803008).

28740392 is a wasteful number, since it uses less digits than its factorization.

28740392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805 (or 1801 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 28740392 is about 5361.0066218948. The cubic root of 28740392 is about 306.3121538711.

The spelling of 28740392 in words is "twenty-eight million, seven hundred forty thousand, three hundred ninety-two".