68989440 has 160 divisors (see below), whose sum is σ = 237859776. Its totient is φ = 16957440.

The previous prime is 68989439. The next prime is 68989483. The reversal of 68989440 is 4498986.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 68989440.

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, 99495 + ... + 100185.

Almost surely, 2^68989440 is an apocalyptic number.

68989440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118929888).

68989440 is an abundant number, since it is smaller than the sum of its proper divisors (168870336).

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

68989440 is a wasteful number, since it uses less digits than its factorization.

68989440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 68989440 is about 8305.9882012919. The cubic root of 68989440 is about 410.1356679722.

The spelling of 68989440 in words is "sixty-eight million, nine hundred eighty-nine thousand, four hundred forty".