68162640 has 160 divisors (see below), whose sum is σ = 260150016. Its totient is φ = 14376960.

The previous prime is 68162629. The next prime is 68162657. The reversal of 68162640 is 4626186.

It is a happy number.

It is a super-2 number, since 2×68162640² = 9292290983539200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20280 + ... + 23400.

Almost surely, 2^68162640 is an apocalyptic number.

68162640 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 68162640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130075008).

68162640 is an abundant number, since it is smaller than the sum of its proper divisors (191987376).

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

68162640 is a wasteful number, since it uses less digits than its factorization.

68162640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157 (or 3151 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 68162640 is about 8256.0668601944. The cubic root of 68162640 is about 408.4906630535.

The spelling of 68162640 in words is "sixty-eight million, one hundred sixty-two thousand, six hundred forty".