28621278 has 24 divisors (see below), whose sum is σ = 70872048. Its totient is φ = 8177472.

The previous prime is 28621267. The next prime is 28621283. The reversal of 28621278 is 87212682.

It is a happy number.

28621278 is a `hidden beast` number, since 2 + 8 + 621 + 27 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113451 + ... + 113702.

It is an arithmetic number, because the mean of its divisors is an integer number (2953002).

Almost surely, 2^28621278 is an apocalyptic number.

28621278 is an abundant number, since it is smaller than the sum of its proper divisors (42250770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28621278 is a wasteful number, since it uses less digits than its factorization.

28621278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227168 (or 227165 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 28621278 is about 5349.8857931735. The cubic root of 28621278 is about 305.8883996470. Note that the first 3 decimals are identical.

The spelling of 28621278 in words is "twenty-eight million, six hundred twenty-one thousand, two hundred seventy-eight".