28764140 has 12 divisors (see below), whose sum is σ = 60404736. Its totient is φ = 11505648.

The previous prime is 28764139. The next prime is 28764161. The reversal of 28764140 is 4146782.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28764097 and 28764106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 719084 + ... + 719123.

It is an arithmetic number, because the mean of its divisors is an integer number (5033728).

Almost surely, 2^28764140 is an apocalyptic number.

28764140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28764140 is an abundant number, since it is smaller than the sum of its proper divisors (31640596).

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

28764140 is a wasteful number, since it uses less digits than its factorization.

28764140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438216 (or 1438214 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28764140 is about 5363.2210470947. The cubic root of 28764140 is about 306.3964985613.

The spelling of 28764140 in words is "twenty-eight million, seven hundred sixty-four thousand, one hundred forty".