168898640 has 40 divisors (see below), whose sum is σ = 398082408. Its totient is φ = 66631680.

The previous prime is 168898607. The next prime is 168898687. The reversal of 168898640 is 46898861.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36096064 + 132802576 = 6008^2 + 11524^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8621 + ... + 20300.

Almost surely, 2^168898640 is an apocalyptic number.

168898640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168898640 is an abundant number, since it is smaller than the sum of its proper divisors (229183768).

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

168898640 is a wasteful number, since it uses less digits than its factorization.

168898640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29007 (or 29001 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 168898640 is about 12996.1009537476. The cubic root of 168898640 is about 552.7669273861.

The spelling of 168898640 in words is "one hundred sixty-eight million, eight hundred ninety-eight thousand, six hundred forty".