662635440 has 120 divisors (see below), whose sum is σ = 2279729088. Its totient is φ = 172385280.

The previous prime is 662635439. The next prime is 662635483. The reversal of 662635440 is 44536266.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 662635395 and 662635404.

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, 18297 + ... + 40743.

Almost surely, 2^662635440 is an apocalyptic number.

662635440 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 662635440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1139864544).

662635440 is an abundant number, since it is smaller than the sum of its proper divisors (1617093648).

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

662635440 is a wasteful number, since it uses less digits than its factorization.

662635440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22507 (or 22498 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 662635440 is about 25741.7062371553. The cubic root of 662635440 is about 871.8161032401.

The spelling of 662635440 in words is "six hundred sixty-two million, six hundred thirty-five thousand, four hundred forty".