28392490 has 16 divisors (see below), whose sum is σ = 58407552. Its totient is φ = 9734544.

The previous prime is 28392487. The next prime is 28392491. The reversal of 28392490 is 9429382.

It is a super-2 number, since 2×28392490² = 1612266976800200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28392491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202734 + ... + 202873.

It is an arithmetic number, because the mean of its divisors is an integer number (3650472).

Almost surely, 2^28392490 is an apocalyptic number.

28392490 is an abundant number, since it is smaller than the sum of its proper divisors (30015062).

28392490 is a wasteful number, since it uses less digits than its factorization.

28392490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405621.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 28392490 is about 5328.4603780079. The cubic root of 28392490 is about 305.0711649760.

It can be divided in two parts, 28392 and 490, that added together give a palindrome (28882).

The spelling of 28392490 in words is "twenty-eight million, three hundred ninety-two thousand, four hundred ninety".