27774990 has 48 divisors (see below), whose sum is σ = 73904688. Its totient is φ = 7233408.

The previous prime is 27774973. The next prime is 27774997. The reversal of 27774990 is 9947772.

27774990 = T₃₉₇ + T₃₉₈ + ... + T₆₁₁.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27774997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 282 + ... + 7458.

It is an arithmetic number, because the mean of its divisors is an integer number (1539681).

Almost surely, 2^27774990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27774990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36952344).

27774990 is an abundant number, since it is smaller than the sum of its proper divisors (46129698).

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

27774990 is a wasteful number, since it uses less digits than its factorization.

27774990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7233 (or 7230 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 27774990 is about 5270.1982884897. The cubic root of 27774990 is about 302.8433003429.

The spelling of 27774990 in words is "twenty-seven million, seven hundred seventy-four thousand, nine hundred ninety".