669637098 has 64 divisors (see below), whose sum is σ = 1606980480. Its totient is φ = 205473024.

The previous prime is 669637069. The next prime is 669637099. The reversal of 669637098 is 890736966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669637099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 302865 + ... + 305067.

It is an arithmetic number, because the mean of its divisors is an integer number (25109070).

Almost surely, 2^669637098 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669637098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803490240).

669637098 is an abundant number, since it is smaller than the sum of its proper divisors (937343382).

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

669637098 is a wasteful number, since it uses less digits than its factorization.

669637098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660 (or 2654 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 669637098 is about 25877.3471978872. The cubic root of 669637098 is about 874.8759978834.

The spelling of 669637098 in words is "six hundred sixty-nine million, six hundred thirty-seven thousand, ninety-eight".