28915020 has 36 divisors (see below), whose sum is σ = 87709440. Its totient is φ = 7710624.

The previous prime is 28915013. The next prime is 28915031. The reversal of 28915020 is 2051982.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80140 + ... + 80499.

Almost surely, 2^28915020 is an apocalyptic number.

28915020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28915020 is an abundant number, since it is smaller than the sum of its proper divisors (58794420).

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

28915020 is a wasteful number, since it uses less digits than its factorization.

28915020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160654 (or 160649 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 28915020 is about 5377.2688234828. The cubic root of 28915020 is about 306.9312907027.

The spelling of 28915020 in words is "twenty-eight million, nine hundred fifteen thousand, twenty".