660726792 has 144 divisors (see below), whose sum is σ = 1984027500. Its totient is φ = 198485760.

The previous prime is 660726791. The next prime is 660726793. The reversal of 660726792 is 297627066.

It is an interprime number because it is at equal distance from previous prime (660726791) and next prime (660726793).

It can be written as a sum of positive squares in 2 ways, for example, as 659154276 + 1572516 = 25674^2 + 1254^2 .

It is a super-2 number, since 2×660726792² = 873119787333222528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (660726791) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1297834 + ... + 1298342.

Almost surely, 2^660726792 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660726792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (992013750).

660726792 is an abundant number, since it is smaller than the sum of its proper divisors (1323300708).

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

660726792 is a wasteful number, since it uses less digits than its factorization.

660726792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 45.

The square root of 660726792 is about 25704.6064354232. The cubic root of 660726792 is about 870.9782416905.

The spelling of 660726792 in words is "six hundred sixty million, seven hundred twenty-six thousand, seven hundred ninety-two".