68402840 has 32 divisors (see below), whose sum is σ = 167898960. Its totient is φ = 24873600.

The previous prime is 68402837. The next prime is 68402843. The reversal of 68402840 is 4820486.

It is an interprime number because it is at equal distance from previous prime (68402837) and next prime (68402843).

It is a junction number, because it is equal to n+sod(n) for n = 68402797 and 68402806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68402843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77291 + ... + 78170.

Almost surely, 2^68402840 is an apocalyptic number.

It is an amenable number.

68402840 is an abundant number, since it is smaller than the sum of its proper divisors (99496120).

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

68402840 is a wasteful number, since it uses less digits than its factorization.

68402840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155483 (or 155479 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 68402840 is about 8270.6009455178. The cubic root of 68402840 is about 408.9699306170.

The spelling of 68402840 in words is "sixty-eight million, four hundred two thousand, eight hundred forty".