68749940 has 108 divisors (see below), whose sum is σ = 175915908. Its totient is φ = 22498560.

The previous prime is 68749903. The next prime is 68749943. The reversal of 68749940 is 4994786.

It can be written as a sum of positive squares in 2 ways, for example, as 31832164 + 36917776 = 5642^2 + 6076^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68749943) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 941744 + ... + 941816.

It is an arithmetic number, because the mean of its divisors is an integer number (1628851).

Almost surely, 2^68749940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68749940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87957954).

68749940 is an abundant number, since it is smaller than the sum of its proper divisors (107165968).

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

68749940 is a wasteful number, since it uses less digits than its factorization.

68749940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 68749940 is about 8291.5583577516. The cubic root of 68749940 is about 409.6605161263.

The spelling of 68749940 in words is "sixty-eight million, seven hundred forty-nine thousand, nine hundred forty".