28618140 has 48 divisors (see below), whose sum is σ = 84847392. Its totient is φ = 7182336.

The previous prime is 28618133. The next prime is 28618147. The reversal of 28618140 is 4181682.

It is an interprime number because it is at equal distance from previous prime (28618133) and next prime (28618147).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28618098 and 28618107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28618147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13009 + ... + 15048.

It is an arithmetic number, because the mean of its divisors is an integer number (1767654).

Almost surely, 2^28618140 is an apocalyptic number.

28618140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28618140 is an abundant number, since it is smaller than the sum of its proper divisors (56229252).

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

28618140 is a wasteful number, since it uses less digits than its factorization.

28618140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28086 (or 28084 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 28618140 is about 5349.5925078458. The cubic root of 28618140 is about 305.8772201685.

The spelling of 28618140 in words is "twenty-eight million, six hundred eighteen thousand, one hundred forty".