68891992 has 64 divisors (see below), whose sum is σ = 147329280. Its totient is φ = 29960832.

The previous prime is 68891987. The next prime is 68892037. The reversal of 68891992 is 29919886.

It is a super-2 number, since 2×68891992² = 9492213123456128, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

Together with 78437288 it forms an amicable pair .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198363 + ... + 198709.

It is an arithmetic number, because the mean of its divisors is an integer number (2302020).

Almost surely, 2^68891992 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 68891992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73664640).

68891992 is an abundant number, since it is smaller than the sum of its proper divisors (78437288).

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

68891992 is a wasteful number, since it uses less digits than its factorization.

68891992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 468 counting only the distinct ones).

The product of its digits is 559872, while the sum is 52.

The square root of 68891992 is about 8300.1199991325. The cubic root of 68891992 is about 409.9424706114.

The spelling of 68891992 in words is "sixty-eight million, eight hundred ninety-one thousand, nine hundred ninety-two".