68431590 has 96 divisors (see below), whose sum is σ = 186338880. Its totient is φ = 17402112.

The previous prime is 68431567. The next prime is 68431603. The reversal of 68431590 is 9513486.

68431590 is a `hidden beast` number, since 68 + 4 + 3 + 1 + 590 = 666.

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, 409687 + ... + 409853.

It is an arithmetic number, because the mean of its divisors is an integer number (1941030).

Almost surely, 2^68431590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68431590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93169440).

68431590 is an abundant number, since it is smaller than the sum of its proper divisors (117907290).

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

68431590 is a wasteful number, since it uses less digits than its factorization.

68431590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 363 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 68431590 is about 8272.3388470251. The cubic root of 68431590 is about 409.0272198494.

The spelling of 68431590 in words is "sixty-eight million, four hundred thirty-one thousand, five hundred ninety".