662187978720 has 288 divisors, whose sum is σ = 2391808517280. Its totient is φ = 166364098560.

The previous prime is 662187978703. The next prime is 662187978773. The reversal of 662187978720 is 27879781266.

It is a tau number, because it is divible by the number of its divisors (288).

It is a super-2 number, since 2×662187978720² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4885302 + ... + 5019018.

It is an arithmetic number, because the mean of its divisors is an integer number (8304890685).

Almost surely, 2^662187978720 is an apocalyptic number.

662187978720 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 662187978720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1195904258640).

662187978720 is an abundant number, since it is smaller than the sum of its proper divisors (1729620538560).

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

662187978720 is a wasteful number, since it uses less digits than its factorization.

662187978720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133938 (or 133927 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 63.

The spelling of 662187978720 in words is "six hundred sixty-two billion, one hundred eighty-seven million, nine hundred seventy-eight thousand, seven hundred twenty".