28623860 has 12 divisors (see below), whose sum is σ = 60110148. Its totient is φ = 11449536.

The previous prime is 28623857. The next prime is 28623871. The reversal of 28623860 is 6832682.

It can be written as a sum of positive squares in 2 ways, for example, as 14092516 + 14531344 = 3754^2 + 3812^2 .

It is a super-2 number, since 2×28623860² = 1638650722599200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28623860.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 715577 + ... + 715616.

It is an arithmetic number, because the mean of its divisors is an integer number (5009179).

Almost surely, 2^28623860 is an apocalyptic number.

28623860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28623860 is an abundant number, since it is smaller than the sum of its proper divisors (31486288).

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

28623860 is a wasteful number, since it uses less digits than its factorization.

28623860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431202 (or 1431200 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 28623860 is about 5350.1271012939. The cubic root of 28623860 is about 305.8975977000.

The spelling of 28623860 in words is "twenty-eight million, six hundred twenty-three thousand, eight hundred sixty".