28951720 has 32 divisors (see below), whose sum is σ = 74448000. Its totient is φ = 9926208.

The previous prime is 28951709. The next prime is 28951729. The reversal of 28951720 is 2715982.

It is not an unprimeable number, because it can be changed into a prime (28951729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51420 + ... + 51979.

It is an arithmetic number, because the mean of its divisors is an integer number (2326500).

Almost surely, 2^28951720 is an apocalyptic number.

28951720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28951720 is an abundant number, since it is smaller than the sum of its proper divisors (45496280).

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

28951720 is a wasteful number, since it uses less digits than its factorization.

28951720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103417 (or 103413 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 28951720 is about 5380.6802543916. The cubic root of 28951720 is about 307.0610919387.

The spelling of 28951720 in words is "twenty-eight million, nine hundred fifty-one thousand, seven hundred twenty".