28012690 has 16 divisors (see below), whose sum is σ = 50483160. Its totient is φ = 11191680.

The previous prime is 28012681. The next prime is 28012693. The reversal of 28012690 is 9621082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 21058921 + 6953769 = 4589^2 + 2637^2 .

It is a super-2 number, since 2×28012690² = 1569421602072200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28012693) 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, 15220 + ... + 16960.

Almost surely, 2^28012690 is an apocalyptic number.

28012690 is a deficient number, since it is larger than the sum of its proper divisors (22470470).

28012690 is a wasteful number, since it uses less digits than its factorization.

28012690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3357.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28012690 is about 5292.7015785891. The cubic root of 28012690 is about 303.7047644424.

The spelling of 28012690 in words is "twenty-eight million, twelve thousand, six hundred ninety".