28401860 has 12 divisors (see below), whose sum is σ = 59643948. Its totient is φ = 11360736.

The previous prime is 28401851. The next prime is 28401911. The reversal of 28401860 is 6810482.

It can be written as a sum of positive squares in 2 ways, for example, as 3161284 + 25240576 = 1778^2 + 5024^2 .

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, 710027 + ... + 710066.

It is an arithmetic number, because the mean of its divisors is an integer number (4970329).

Almost surely, 2^28401860 is an apocalyptic number.

28401860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28401860 is an abundant number, since it is smaller than the sum of its proper divisors (31242088).

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

28401860 is a wasteful number, since it uses less digits than its factorization.

28401860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420102 (or 1420100 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 28401860 is about 5329.3395463228. The cubic root of 28401860 is about 305.1047208261.

The spelling of 28401860 in words is "twenty-eight million, four hundred one thousand, eight hundred sixty".