27990620 has 24 divisors (see below), whose sum is σ = 67177824. Its totient is φ = 9596736.

The previous prime is 27990617. The next prime is 27990631. The reversal of 27990620 is 2609972.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 99827 + ... + 100106.

It is an arithmetic number, because the mean of its divisors is an integer number (2799076).

Almost surely, 2^27990620 is an apocalyptic number.

27990620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27990620 is an abundant number, since it is smaller than the sum of its proper divisors (39187204).

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

27990620 is a wasteful number, since it uses less digits than its factorization.

27990620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199949 (or 199947 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 27990620 is about 5290.6162211977. The cubic root of 27990620 is about 303.6249848236.

The spelling of 27990620 in words is "twenty-seven million, nine hundred ninety thousand, six hundred twenty".