68889690 has 40 divisors (see below), whose sum is σ = 185238900. Its totient is φ = 18370368.

The previous prime is 68889683. The next prime is 68889697. The reversal of 68889690 is 9698886.

It is an interprime number because it is at equal distance from previous prime (68889683) and next prime (68889697).

It can be written as a sum of positive squares in 2 ways, for example, as 68409441 + 480249 = 8271^2 + 693^2 .

It is a super-2 number, since 2×68889690² = 9491578776592200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68889697) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41715 + ... + 43334.

Almost surely, 2^68889690 is an apocalyptic number.

68889690 is an abundant number, since it is smaller than the sum of its proper divisors (116349210).

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

68889690 is a wasteful number, since it uses less digits than its factorization.

68889690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85068 (or 85059 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 68889690 is about 8299.9813252802. The cubic root of 68889690 is about 409.9379045361.

The spelling of 68889690 in words is "sixty-eight million, eight hundred eighty-nine thousand, six hundred ninety".