669950640 has 120 divisors (see below), whose sum is σ = 2368382640. Its totient is φ = 169247232.

The previous prime is 669950623. The next prime is 669950657. The reversal of 669950640 is 46059966.

It is an interprime number because it is at equal distance from previous prime (669950623) and next prime (669950657).

It is a tau number, because it is divible by the number of its divisors (120).

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

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10807 + ... + 38166.

It is an arithmetic number, because the mean of its divisors is an integer number (19736522).

Almost surely, 2^669950640 is an apocalyptic number.

669950640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669950640 is an abundant number, since it is smaller than the sum of its proper divisors (1698432000).

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

669950640 is a wasteful number, since it uses less digits than its factorization.

669950640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49011 (or 49002 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 669950640 is about 25883.4047219449. The cubic root of 669950640 is about 875.0125233582.

The spelling of 669950640 in words is "six hundred sixty-nine million, nine hundred fifty thousand, six hundred forty".