659778432 has 128 divisors (see below), whose sum is σ = 1868313600. Its totient is φ = 205578240.

The previous prime is 659778421. The next prime is 659778443. The reversal of 659778432 is 234877956.

It is an interprime number because it is at equal distance from previous prime (659778421) and next prime (659778443).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1377169 + ... + 1377647.

It is an arithmetic number, because the mean of its divisors is an integer number (14596200).

Almost surely, 2^659778432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 659778432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934156800).

659778432 is an abundant number, since it is smaller than the sum of its proper divisors (1208535168).

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

659778432 is a wasteful number, since it uses less digits than its factorization.

659778432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 712 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 51.

The square root of 659778432 is about 25686.1525340017. The cubic root of 659778432 is about 870.5613288581.

The spelling of 659778432 in words is "six hundred fifty-nine million, seven hundred seventy-eight thousand, four hundred thirty-two".