68999644 has 36 divisors (see below), whose sum is σ = 141255576. Its totient is φ = 29404704.

The previous prime is 68999629. The next prime is 68999647. The reversal of 68999644 is 44699986.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68999647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37719 + ... + 39505.

It is an arithmetic number, because the mean of its divisors is an integer number (3923766).

Almost surely, 2^68999644 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 68999644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70627788).

68999644 is an abundant number, since it is smaller than the sum of its proper divisors (72255932).

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

68999644 is a wasteful number, since it uses less digits than its factorization.

68999644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002 (or 1993 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The square root of 68999644 is about 8306.6024342086. The cubic root of 68999644 is about 410.1558875789.

The spelling of 68999644 in words is "sixty-eight million, nine hundred ninety-nine thousand, six hundred forty-four".