981601664 has 32 divisors (see below), whose sum is σ = 2003241240. Its totient is φ = 478827520.

The previous prime is 981601661. The next prime is 981601679. The reversal of 981601664 is 466106189.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981601661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88274 + ... + 98769.

Almost surely, 2^981601664 is an apocalyptic number.

It is an amenable number.

981601664 is an abundant number, since it is smaller than the sum of its proper divisors (1021639576).

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

981601664 is a wasteful number, since it uses less digits than its factorization.

981601664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187098 (or 187086 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 981601664 is about 31330.5228810500. The cubic root of 981601664 is about 993.8292211464.

The spelling of 981601664 in words is "nine hundred eighty-one million, six hundred one thousand, six hundred sixty-four".