665248990 has 24 divisors (see below), whose sum is σ = 1392950952. Its totient is φ = 228085200.

The previous prime is 665248979. The next prime is 665248999. The reversal of 665248990 is 99842566.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665248999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 678336 + ... + 679315.

It is an arithmetic number, because the mean of its divisors is an integer number (58039623).

Almost surely, 2^665248990 is an apocalyptic number.

665248990 is an abundant number, since it is smaller than the sum of its proper divisors (727701962).

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

665248990 is a wasteful number, since it uses less digits than its factorization.

665248990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357672 (or 1357665 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 665248990 is about 25792.4211736704. The cubic root of 665248990 is about 872.9607979643.

The spelling of 665248990 in words is "six hundred sixty-five million, two hundred forty-eight thousand, nine hundred ninety".