28537138 has 32 divisors (see below), whose sum is σ = 50889600. Its totient is φ = 11746944.

The previous prime is 28537129. The next prime is 28537147. The reversal of 28537138 is 83173582.

It is an interprime number because it is at equal distance from previous prime (28537129) and next prime (28537147).

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 28537097 and 28537106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45793 + ... + 46411.

It is an arithmetic number, because the mean of its divisors is an integer number (1590300).

Almost surely, 2^28537138 is an apocalyptic number.

28537138 is a deficient number, since it is larger than the sum of its proper divisors (22352462).

28537138 is a wasteful number, since it uses less digits than its factorization.

28537138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754.

The product of its digits is 40320, while the sum is 37.

The square root of 28537138 is about 5342.0162860104. The cubic root of 28537138 is about 305.5883581656.

It can be divided in two parts, 28 and 537138, that added together give a triangular number (537166 = T₁₀₃₆).

The spelling of 28537138 in words is "twenty-eight million, five hundred thirty-seven thousand, one hundred thirty-eight".