68406240 has 96 divisors (see below), whose sum is σ = 246274560. Its totient is φ = 15634944.

The previous prime is 68406227. The next prime is 68406241. The reversal of 68406240 is 4260486.

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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 68406198 and 68406207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68406241) 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, 6820 + ... + 13539.

It is an arithmetic number, because the mean of its divisors is an integer number (2565360).

Almost surely, 2^68406240 is an apocalyptic number.

68406240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68406240 is an abundant number, since it is smaller than the sum of its proper divisors (177868320).

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

68406240 is a wasteful number, since it uses less digits than its factorization.

68406240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20384 (or 20376 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 68406240 is about 8270.8064903007. The cubic root of 68406240 is about 408.9767065283.

The spelling of 68406240 in words is "sixty-eight million, four hundred six thousand, two hundred forty".