68379269640 has 256 divisors, whose sum is σ = 226491552000. Its totient is φ = 16377446400.

The previous prime is 68379269633. The next prime is 68379269657. The reversal of 68379269640 is 4696297386.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66972330 + ... + 66973350.

It is an arithmetic number, because the mean of its divisors is an integer number (884732625).

Almost surely, 2^68379269640 is an apocalyptic number.

68379269640 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 68379269640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113245776000).

68379269640 is an abundant number, since it is smaller than the sum of its proper divisors (158112282360).

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

68379269640 is a wasteful number, since it uses less digits than its factorization.

68379269640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608 (or 1604 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 60.

The spelling of 68379269640 in words is "sixty-eight billion, three hundred seventy-nine million, two hundred sixty-nine thousand, six hundred forty".