28152538 has 8 divisors (see below), whose sum is σ = 42647220. Its totient is φ = 13936800.

The previous prime is 28152511. The next prime is 28152563. The reversal of 28152538 is 83525182.

It can be written as a sum of positive squares in 2 ways, for example, as 27846729 + 305809 = 5277^2 + 553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69483 + ... + 69886.

Almost surely, 2^28152538 is an apocalyptic number.

28152538 is a deficient number, since it is larger than the sum of its proper divisors (14494682).

28152538 is a wasteful number, since it uses less digits than its factorization.

28152538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139472.

The product of its digits is 19200, while the sum is 34.

The square root of 28152538 is about 5305.8965312188. The cubic root of 28152538 is about 304.2093217301.

The spelling of 28152538 in words is "twenty-eight million, one hundred fifty-two thousand, five hundred thirty-eight".