68990019840 has 720 divisors, whose sum is σ = 294461975808. Its totient is φ = 15079882752.

The previous prime is 68990019827. The next prime is 68990019877. The reversal of 68990019840 is 4891009986.

It is a tau number, because it is divible by the number of its divisors (720).

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

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 16690414 + ... + 16694546.

Almost surely, 2^68990019840 is an apocalyptic number.

68990019840 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 68990019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147230987904).

68990019840 is an abundant number, since it is smaller than the sum of its proper divisors (225471955968).

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

68990019840 is a wasteful number, since it uses less digits than its factorization.

68990019840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196 (or 4173 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 68990019840 in words is "sixty-eight billion, nine hundred ninety million, nineteen thousand, eight hundred forty".