28001278 has 32 divisors (see below), whose sum is σ = 46539360. Its totient is φ = 12579840.

The previous prime is 28001251. The next prime is 28001291. The reversal of 28001278 is 87210082.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73693 + ... + 74071.

It is an arithmetic number, because the mean of its divisors is an integer number (1454355).

Almost surely, 2^28001278 is an apocalyptic number.

28001278 is a deficient number, since it is larger than the sum of its proper divisors (18538082).

28001278 is a wasteful number, since it uses less digits than its factorization.

28001278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28001278 is about 5291.6233804004. The cubic root of 28001278 is about 303.6635170705.

The spelling of 28001278 in words is "twenty-eight million, one thousand, two hundred seventy-eight".