969866640 has 120 divisors (see below), whose sum is σ = 3289630968. Its totient is φ = 256051200.

The previous prime is 969866629. The next prime is 969866693. The reversal of 969866640 is 46668969.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 223921296 + 745945344 = 14964^2 + 27312^2 .

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

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, 66052 + ... + 79388.

Almost surely, 2^969866640 is an apocalyptic number.

969866640 is a gapful number since it is divisible by the number (90) 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 969866640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1644815484).

969866640 is an abundant number, since it is smaller than the sum of its proper divisors (2319764328).

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

969866640 is a wasteful number, since it uses less digits than its factorization.

969866640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13457 (or 13448 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The square root of 969866640 is about 31142.6819654313. The cubic root of 969866640 is about 989.8529319338.

The spelling of 969866640 in words is "nine hundred sixty-nine million, eight hundred sixty-six thousand, six hundred forty".