68421375 has 128 divisors (see below), whose sum is σ = 146764800. Its totient is φ = 31104000.

The previous prime is 68421373. The next prime is 68421401. The reversal of 68421375 is 57312486.

It is not a de Polignac number, because 68421375 - 2¹ = 68421373 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68421373) 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 127 ways as a sum of consecutive naturals, for example, 705327 + ... + 705423.

It is an arithmetic number, because the mean of its divisors is an integer number (1146600).

Almost surely, 2^68421375 is an apocalyptic number.

68421375 is an abundant number, since it is smaller than the sum of its proper divisors (78343425).

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

68421375 is a wasteful number, since it uses less digits than its factorization.

68421375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 135 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 68421375 is about 8271.7214048830. The cubic root of 68421375 is about 409.0068665741.

Subtracting from 68421375 its reverse (57312486), we obtain a square (11108889 = 3333²).

The spelling of 68421375 in words is "sixty-eight million, four hundred twenty-one thousand, three hundred seventy-five".