28912490 has 24 divisors (see below), whose sum is σ = 54932580. Its totient is φ = 10954944.

The previous prime is 28912487. The next prime is 28912493. The reversal of 28912490 is 9421982.

It is an interprime number because it is at equal distance from previous prime (28912487) and next prime (28912493).

It can be written as a sum of positive squares in 2 ways, for example, as 28912129 + 361 = 5377^2 + 19^2 .

It is a super-3 number, since 3×28912490³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28912490.

It is not an unprimeable number, because it can be changed into a prime (28912493) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 395 + ... + 7614.

Almost surely, 2^28912490 is an apocalyptic number.

28912490 is a deficient number, since it is larger than the sum of its proper divisors (26020090).

28912490 is a wasteful number, since it uses less digits than its factorization.

28912490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8054 (or 8035 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 28912490 is about 5377.0335687998. The cubic root of 28912490 is about 306.9223385063.

The spelling of 28912490 in words is "twenty-eight million, nine hundred twelve thousand, four hundred ninety".