68904780 has 144 divisors (see below), whose sum is σ = 234420480. Its totient is φ = 15050112.

The previous prime is 68904769. The next prime is 68904833. The reversal of 68904780 is 8740986.

It is a happy number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67111 + ... + 68129.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^68904780 is an apocalyptic number.

68904780 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 68904780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117210240).

68904780 is an abundant number, since it is smaller than the sum of its proper divisors (165515700).

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

68904780 is a wasteful number, since it uses less digits than its factorization.

68904780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 68904780 is about 8300.8903136953. The cubic root of 68904780 is about 409.9678340817.

The spelling of 68904780 in words is "sixty-eight million, nine hundred four thousand, seven hundred eighty".