28157310 has 48 divisors (see below), whose sum is σ = 74602944. Its totient is φ = 7365696.

The previous prime is 28157309. The next prime is 28157323. The reversal of 28157310 is 1375182.

28157310 is a `hidden beast` number, since 2 + 81 + 573 + 10 = 666.

It is a super-2 number, since 2×28157310² = 1585668212872200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1819 + ... + 7721.

It is an arithmetic number, because the mean of its divisors is an integer number (1554228).

Almost surely, 2^28157310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28157310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37301472).

28157310 is an abundant number, since it is smaller than the sum of its proper divisors (46445634).

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

28157310 is a wasteful number, since it uses less digits than its factorization.

28157310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5969 (or 5966 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 28157310 is about 5306.3462005414. The cubic root of 28157310 is about 304.2265091072.

The spelling of 28157310 in words is "twenty-eight million, one hundred fifty-seven thousand, three hundred ten".