27957790 has 32 divisors (see below), whose sum is σ = 57729024. Its totient is φ = 9549600.

The previous prime is 27957781. The next prime is 27957791. The reversal of 27957790 is 9775972.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 27957790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27957791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23715 + ... + 24865.

It is an arithmetic number, because the mean of its divisors is an integer number (1804032).

Almost surely, 2^27957790 is an apocalyptic number.

27957790 is an abundant number, since it is smaller than the sum of its proper divisors (29771234).

27957790 is a wasteful number, since it uses less digits than its factorization.

27957790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512.

The product of its (nonzero) digits is 277830, while the sum is 46.

The square root of 27957790 is about 5287.5126477390. The cubic root of 27957790 is about 303.5062318517.

It can be divided in two parts, 2795 and 7790, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 27957790 in words is "twenty-seven million, nine hundred fifty-seven thousand, seven hundred ninety".