28701312 has 64 divisors (see below), whose sum is σ = 78140160. Its totient is φ = 9328640.

The previous prime is 28701311. The next prime is 28701377. The reversal of 28701312 is 21310782.

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

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

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

It is not an unprimeable number, because it can be changed into a prime (28701311) 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, 14833 + ... + 16655.

It is an arithmetic number, because the mean of its divisors is an integer number (1220940).

Almost surely, 2^28701312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28701312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39070080).

28701312 is an abundant number, since it is smaller than the sum of its proper divisors (49438848).

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

28701312 is a wasteful number, since it uses less digits than its factorization.

28701312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881 (or 1869 counting only the distinct ones).

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

The square root of 28701312 is about 5357.3605441486. The cubic root of 28701312 is about 306.1732540164.

The spelling of 28701312 in words is "twenty-eight million, seven hundred one thousand, three hundred twelve".