981664 has 12 divisors (see below), whose sum is σ = 1932714. Its totient is φ = 490816.

The previous prime is 981653. The next prime is 981683. The reversal of 981664 is 466189.

It can be written as a sum of positive squares in only one way, i.e., 739600 + 242064 = 860^2 + 492^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15307 + ... + 15370.

2⁹⁸¹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

981664 is a deficient number, since it is larger than the sum of its proper divisors (951050).

981664 is a wasteful number, since it uses less digits than its factorization.

981664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30687 (or 30679 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 981664 is about 990.7895841197. The cubic root of 981664 is about 99.3850258202.

The spelling of 981664 in words is "nine hundred eighty-one thousand, six hundred sixty-four".