68861890 has 16 divisors (see below), whose sum is σ = 130475520. Its totient is φ = 26094960.

The previous prime is 68861887. The next prime is 68861899. The reversal of 68861890 is 9816886.

It is a self number, because there is not a number n which added to its sum of digits gives 68861890.

It is not an unprimeable number, because it can be changed into a prime (68861899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181026 + ... + 181405.

It is an arithmetic number, because the mean of its divisors is an integer number (8154720).

Almost surely, 2^68861890 is an apocalyptic number.

68861890 is a deficient number, since it is larger than the sum of its proper divisors (61613630).

68861890 is a wasteful number, since it uses less digits than its factorization.

68861890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362457.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 68861890 is about 8298.3064537290. The cubic root of 68861890 is about 409.8827544981.

It can be divided in two parts, 68861 and 890, that added together give a triangular number (69751 = T₃₇₃).

The spelling of 68861890 in words is "sixty-eight million, eight hundred sixty-one thousand, eight hundred ninety".