28726537 has 16 divisors (see below), whose sum is σ = 35368960. Its totient is φ = 22779792.

The previous prime is 28726531. The next prime is 28726543. The reversal of 28726537 is 73562782.

It is an interprime number because it is at equal distance from previous prime (28726531) and next prime (28726543).

It is not a de Polignac number, because 28726537 - 2⁷ = 28726409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28726537.

It is not an unprimeable number, because it can be changed into a prime (28726531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3208 + ... + 8230.

It is an arithmetic number, because the mean of its divisors is an integer number (2210560).

Almost surely, 2^28726537 is an apocalyptic number.

It is an amenable number.

28726537 is a deficient number, since it is larger than the sum of its proper divisors (6642423).

28726537 is a wasteful number, since it uses less digits than its factorization.

28726537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5092.

The product of its digits is 141120, while the sum is 40.

The square root of 28726537 is about 5359.7142647720. The cubic root of 28726537 is about 306.2629242359.

It can be divided in two parts, 2872 and 6537, that added together give a square (9409 = 97²).

The spelling of 28726537 in words is "twenty-eight million, seven hundred twenty-six thousand, five hundred thirty-seven".