27789990 has 32 divisors (see below), whose sum is σ = 67154400. Its totient is φ = 7359744.

The previous prime is 27789973. The next prime is 27789991. The reversal of 27789990 is 9998772.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27789991) 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, 1362 + ... + 7578.

It is an arithmetic number, because the mean of its divisors is an integer number (2098575).

Almost surely, 2^27789990 is an apocalyptic number.

27789990 is an abundant number, since it is smaller than the sum of its proper divisors (39364410).

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

27789990 is a wasteful number, since it uses less digits than its factorization.

27789990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6376.

The product of its (nonzero) digits is 571536, while the sum is 51.

The square root of 27789990 is about 5271.6211927641. The cubic root of 27789990 is about 302.8978077972.

The spelling of 27789990 in words is "twenty-seven million, seven hundred eighty-nine thousand, nine hundred ninety".