669539520 has 280 divisors, whose sum is σ = 2566166064. Its totient is φ = 164726784.

The previous prime is 669539491. The next prime is 669539527. The reversal of 669539520 is 25935966.

669539520 is a `hidden beast` number, since 6 + 6 + 95 + 39 + 520 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (669539527) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 335967 + ... + 337953.

Almost surely, 2^669539520 is an apocalyptic number.

669539520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669539520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1283083032).

669539520 is an abundant number, since it is smaller than the sum of its proper divisors (1896626544).

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

669539520 is a wasteful number, since it uses less digits than its factorization.

669539520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029 (or 2010 counting only the distinct ones).

The product of its (nonzero) digits is 437400, while the sum is 45.

The square root of 669539520 is about 25875.4617350106. The cubic root of 669539520 is about 874.8335008368.

The spelling of 669539520 in words is "six hundred sixty-nine million, five hundred thirty-nine thousand, five hundred twenty".