28137420 has 36 divisors (see below), whose sum is σ = 85350720. Its totient is φ = 7503264.

The previous prime is 28137419. The next prime is 28137433. The reversal of 28137420 is 2473182.

It is a tau number, because it is divible by the number of its divisors (36).

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, 77980 + ... + 78339.

Almost surely, 2^28137420 is an apocalyptic number.

28137420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28137420 is an abundant number, since it is smaller than the sum of its proper divisors (57213300).

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

28137420 is a wasteful number, since it uses less digits than its factorization.

28137420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156334 (or 156329 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28137420 is about 5304.4716984823. The cubic root of 28137420 is about 304.1548581976.

The spelling of 28137420 in words is "twenty-eight million, one hundred thirty-seven thousand, four hundred twenty".