68918940 has 36 divisors (see below), whose sum is σ = 209054664. Its totient is φ = 18378336.

The previous prime is 68918933. The next prime is 68918953. The reversal of 68918940 is 4981986.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 191262 + ... + 191621.

It is an arithmetic number, because the mean of its divisors is an integer number (5807074).

Almost surely, 2^68918940 is an apocalyptic number.

68918940 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68918940 is an abundant number, since it is smaller than the sum of its proper divisors (140135724).

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

68918940 is a wasteful number, since it uses less digits than its factorization.

68918940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382898 (or 382893 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 68918940 is about 8301.7431904390. The cubic root of 68918940 is about 409.9959150892.

The spelling of 68918940 in words is "sixty-eight million, nine hundred eighteen thousand, nine hundred forty".