28215634 has 8 divisors (see below), whose sum is σ = 42348528. Its totient is φ = 14099460.

The previous prime is 28215619. The next prime is 28215653. The reversal of 28215634 is 43651282.

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

It is a super-2 number, since 2×28215634² = 1592244004043912, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28215596 and 28215605.

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, 1689 + ... + 7699.

It is an arithmetic number, because the mean of its divisors is an integer number (5293566).

Almost surely, 2^28215634 is an apocalyptic number.

28215634 is a deficient number, since it is larger than the sum of its proper divisors (14132894).

28215634 is a wasteful number, since it uses less digits than its factorization.

28215634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8360.

The product of its digits is 11520, while the sum is 31.

The square root of 28215634 is about 5311.8390412361. The cubic root of 28215634 is about 304.4364187160.

The spelling of 28215634 in words is "twenty-eight million, two hundred fifteen thousand, six hundred thirty-four".