68437728 has 36 divisors (see below), whose sum is σ = 194620608. Its totient is φ = 22812480.

The previous prime is 68437703. The next prime is 68437771. The reversal of 68437728 is 82773486.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×68437728² = 9367445227603968, 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 5 ways as a sum of consecutive naturals, for example, 118528 + ... + 119103.

It is an arithmetic number, because the mean of its divisors is an integer number (5406128).

Almost surely, 2^68437728 is an apocalyptic number.

It is an amenable number.

68437728 is an abundant number, since it is smaller than the sum of its proper divisors (126182880).

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

68437728 is a wasteful number, since it uses less digits than its factorization.

68437728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237647 (or 237636 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 68437728 is about 8272.7098341475. The cubic root of 68437728 is about 409.0394487728.

The spelling of 68437728 in words is "sixty-eight million, four hundred thirty-seven thousand, seven hundred twenty-eight".