669015750 has 128 divisors (see below), whose sum is σ = 1830366720. Its totient is φ = 161750400.

The previous prime is 669015749. The next prime is 669015791. The reversal of 669015750 is 57510966.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 669015699 and 669015708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 574669 + ... + 575831.

It is an arithmetic number, because the mean of its divisors is an integer number (14299740).

Almost surely, 2^669015750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669015750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (915183360).

669015750 is an abundant number, since it is smaller than the sum of its proper divisors (1161350970).

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

669015750 is a wasteful number, since it uses less digits than its factorization.

669015750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 39.

The square root of 669015750 is about 25865.3387760532. The cubic root of 669015750 is about 874.6053185987.

The spelling of 669015750 in words is "six hundred sixty-nine million, fifteen thousand, seven hundred fifty".