27790890 has 32 divisors (see below), whose sum is σ = 67507776. Its totient is φ = 7320960.

The previous prime is 27790879. The next prime is 27790897. The reversal of 27790890 is 9809772.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27790897) 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, 3091 + ... + 8070.

It is an arithmetic number, because the mean of its divisors is an integer number (2109618).

Almost surely, 2^27790890 is an apocalyptic number.

27790890 is an abundant number, since it is smaller than the sum of its proper divisors (39716886).

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

27790890 is a wasteful number, since it uses less digits than its factorization.

27790890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11254.

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

The square root of 27790890 is about 5271.7065548075. The cubic root of 27790890 is about 302.9010776207.

It can be divided in two parts, 27790 and 890, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 27790890 in words is "twenty-seven million, seven hundred ninety thousand, eight hundred ninety".