68597640 has 96 divisors (see below), whose sum is σ = 225552600. Its totient is φ = 18078720.

The previous prime is 68597623. The next prime is 68597671. The reversal of 68597640 is 4679586.

It can be written as a sum of positive squares in 4 ways, for example, as 60746436 + 7851204 = 7794^2 + 2802^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 30970 + ... + 33110.

Almost surely, 2^68597640 is an apocalyptic number.

68597640 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 68597640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112776300).

68597640 is an abundant number, since it is smaller than the sum of its proper divisors (156954960).

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

68597640 is a wasteful number, since it uses less digits than its factorization.

68597640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247 (or 2240 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 68597640 is about 8282.3692262540. The cubic root of 68597640 is about 409.3577889546.

The spelling of 68597640 in words is "sixty-eight million, five hundred ninety-seven thousand, six hundred forty".