28278634 has 8 divisors (see below), whose sum is σ = 43786368. Its totient is φ = 13683180.

The previous prime is 28278617. The next prime is 28278671. The reversal of 28278634 is 43687282.

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

It is a super-2 number, since 2×28278634² = 1599362281811912, which contains 22 as substring.

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, 227992 + ... + 228115.

It is an arithmetic number, because the mean of its divisors is an integer number (5473296).

Almost surely, 2^28278634 is an apocalyptic number.

28278634 is a deficient number, since it is larger than the sum of its proper divisors (15507734).

28278634 is a wasteful number, since it uses less digits than its factorization.

28278634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456140.

The product of its digits is 129024, while the sum is 40.

The square root of 28278634 is about 5317.7658842788. The cubic root of 28278634 is about 304.6628326416.

The spelling of 28278634 in words is "twenty-eight million, two hundred seventy-eight thousand, six hundred thirty-four".