28917120 has 64 divisors (see below), whose sum is σ = 92179440. Its totient is φ = 7710720.

The previous prime is 28917101. The next prime is 28917151. The reversal of 28917120 is 2171982.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5611 + ... + 9450.

Almost surely, 2^28917120 is an apocalyptic number.

28917120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28917120 is an abundant number, since it is smaller than the sum of its proper divisors (63262320).

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

28917120 is a wasteful number, since it uses less digits than its factorization.

28917120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15083 (or 15071 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 28917120 is about 5377.4640863515. The cubic root of 28917120 is about 306.9387209830.

It can be divided in two parts, 2891 and 7120, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 28917120 in words is "twenty-eight million, nine hundred seventeen thousand, one hundred twenty".