28756497 has 24 divisors (see below), whose sum is σ = 48169408. Its totient is φ = 14937120.

The previous prime is 28756477. The next prime is 28756517. The reversal of 28756497 is 79465782.

It is an interprime number because it is at equal distance from previous prime (28756477) and next prime (28756517).

It is not a de Polignac number, because 28756497 - 2¹² = 28752401 is a prime.

It is a super-2 number, since 2×28756497² = 1653872239422018, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28756447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3118 + ... + 8199.

Almost surely, 2^28756497 is an apocalyptic number.

It is an amenable number.

28756497 is a deficient number, since it is larger than the sum of its proper divisors (19412911).

28756497 is a wasteful number, since it uses less digits than its factorization.

28756497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11349 (or 11338 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The square root of 28756497 is about 5362.5084615318. The cubic root of 28756497 is about 306.3693583341.

It can be divided in two parts, 287564 and 97, that added together give a triangular number (287661 = T₇₅₈).

The spelling of 28756497 in words is "twenty-eight million, seven hundred fifty-six thousand, four hundred ninety-seven".