662144640 has 128 divisors (see below), whose sum is σ = 2122416000. Its totient is φ = 175583232.

The previous prime is 662144633. The next prime is 662144641. The reversal of 662144640 is 46441266.

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

It is not an unprimeable number, because it can be changed into a prime (662144641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 381214 + ... + 382946.

It is an arithmetic number, because the mean of its divisors is an integer number (16581375).

Almost surely, 2^662144640 is an apocalyptic number.

662144640 is a gapful number since it is divisible by the number (60) 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 662144640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1061208000).

662144640 is an abundant number, since it is smaller than the sum of its proper divisors (1460271360).

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

662144640 is a wasteful number, since it uses less digits than its factorization.

662144640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1954 (or 1942 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 662144640 is about 25732.1713036425. The cubic root of 662144640 is about 871.6008048505.

The spelling of 662144640 in words is "six hundred sixty-two million, one hundred forty-four thousand, six hundred forty".