28295140 has 24 divisors (see below), whose sum is σ = 62915832. Its totient is φ = 10652160.

The previous prime is 28295119. The next prime is 28295153. The reversal of 28295140 is 4159282.

It can be written as a sum of positive squares in 4 ways, for example, as 5484964 + 22810176 = 2342^2 + 4776^2 .

It is a super-2 number, since 2×28295140² = 1601229895239200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 41271 + ... + 41950.

It is an arithmetic number, because the mean of its divisors is an integer number (2621493).

Almost surely, 2^28295140 is an apocalyptic number.

28295140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28295140 is an abundant number, since it is smaller than the sum of its proper divisors (34620692).

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

28295140 is a wasteful number, since it uses less digits than its factorization.

28295140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83247 (or 83245 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28295140 is about 5319.3176254102. The cubic root of 28295140 is about 304.7220974870.

The spelling of 28295140 in words is "twenty-eight million, two hundred ninety-five thousand, one hundred forty".