28176780 has 24 divisors (see below), whose sum is σ = 78895152. Its totient is φ = 7513792.

The previous prime is 28176763. The next prime is 28176787. The reversal of 28176780 is 8767182.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28176787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234747 + ... + 234866.

It is an arithmetic number, because the mean of its divisors is an integer number (3287298).

Almost surely, 2^28176780 is an apocalyptic number.

28176780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28176780 is an abundant number, since it is smaller than the sum of its proper divisors (50718372).

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

28176780 is a wasteful number, since it uses less digits than its factorization.

28176780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469625 (or 469623 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 28176780 is about 5308.1804792226. The cubic root of 28176780 is about 304.2966143528.

The spelling of 28176780 in words is "twenty-eight million, one hundred seventy-six thousand, seven hundred eighty".