28470538 has 8 divisors (see below), whose sum is σ = 43860132. Its totient is φ = 13850496.

The previous prime is 28470499. The next prime is 28470613. The reversal of 28470538 is 83507482.

It can be written as a sum of positive squares in 2 ways, for example, as 26347689 + 2122849 = 5133^2 + 1457^2 .

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

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 = 28470497 and 28470506.

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, 192295 + ... + 192442.

Almost surely, 2^28470538 is an apocalyptic number.

28470538 is a deficient number, since it is larger than the sum of its proper divisors (15389594).

28470538 is a wasteful number, since it uses less digits than its factorization.

28470538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384776.

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28470538 is about 5335.7790434013. The cubic root of 28470538 is about 305.3504455215.

The spelling of 28470538 in words is "twenty-eight million, four hundred seventy thousand, five hundred thirty-eight".