659926440 has 160 divisors (see below), whose sum is σ = 2228224680. Its totient is φ = 175177728.

The previous prime is 659926433. The next prime is 659926453. The reversal of 659926440 is 44629956.

It can be written as a sum of positive squares in 4 ways, for example, as 643231044 + 16695396 = 25362^2 + 4086^2 .

It is a super-2 number, since 2×659926440² = 871005812422147200, which contains 22 as substring.

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 39 ways as a sum of consecutive naturals, for example, 1143432 + ... + 1144008.

Almost surely, 2^659926440 is an apocalyptic number.

659926440 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 659926440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114112340).

659926440 is an abundant number, since it is smaller than the sum of its proper divisors (1568298240).

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

659926440 is a wasteful number, since it uses less digits than its factorization.

659926440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 953 (or 940 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 659926440 is about 25689.0334578785. The cubic root of 659926440 is about 870.6264216231.

The spelling of 659926440 in words is "six hundred fifty-nine million, nine hundred twenty-six thousand, four hundred forty".