28731120 has 80 divisors (see below), whose sum is σ = 97172352. Its totient is φ = 6964480.

The previous prime is 28731103. The next prime is 28731137. The reversal of 28731120 is 2113782.

It is an interprime number because it is at equal distance from previous prime (28731103) and next prime (28731137).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2802 + ... + 8081.

Almost surely, 2^28731120 is an apocalyptic number.

28731120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28731120 is an abundant number, since it is smaller than the sum of its proper divisors (68441232).

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

28731120 is a wasteful number, since it uses less digits than its factorization.

28731120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10910 (or 10904 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 28731120 is about 5360.1417891694. The cubic root of 28731120 is about 306.2792103195.

It can be divided in two parts, 2873 and 1120, that added together give a palindrome (3993).

The spelling of 28731120 in words is "twenty-eight million, seven hundred thirty-one thousand, one hundred twenty".