68679840 has 96 divisors (see below), whose sum is σ = 225783936. Its totient is φ = 17515520.

The previous prime is 68679833. The next prime is 68679841. The reversal of 68679840 is 4897686.

It is a tau number, because it is divible by the number of its divisors (96).

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 68679840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68679841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7930 + ... + 14150.

It is an arithmetic number, because the mean of its divisors is an integer number (2351916).

Almost surely, 2^68679840 is an apocalyptic number.

68679840 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 68679840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112891968).

68679840 is an abundant number, since it is smaller than the sum of its proper divisors (157104096).

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

68679840 is a wasteful number, since it uses less digits than its factorization.

68679840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6262 (or 6254 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 68679840 is about 8287.3300887560. The cubic root of 68679840 is about 409.5212337352.

The spelling of 68679840 in words is "sixty-eight million, six hundred seventy-nine thousand, eight hundred forty".