27870990 has 128 divisors (see below), whose sum is σ = 83524608. Its totient is φ = 5806080.

The previous prime is 27870989. The next prime is 27870991. The reversal of 27870990 is 9907872.

It is an interprime number because it is at equal distance from previous prime (27870989) and next prime (27870991).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27870991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131985 + ... + 132195.

It is an arithmetic number, because the mean of its divisors is an integer number (652536).

Almost surely, 2^27870990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27870990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41762304).

27870990 is an abundant number, since it is smaller than the sum of its proper divisors (55653618).

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

27870990 is a wasteful number, since it uses less digits than its factorization.

27870990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 27870990 is about 5279.2982488206. The cubic root of 27870990 is about 303.1918096265.

The spelling of 27870990 in words is "twenty-seven million, eight hundred seventy thousand, nine hundred ninety".