68902145 has 24 divisors (see below), whose sum is σ = 90839736. Its totient is φ = 50139648.

The previous prime is 68902121. The next prime is 68902157. The reversal of 68902145 is 54120986.

It can be written as a sum of positive squares in 12 ways, for example, as 55115776 + 13786369 = 7424^2 + 3713^2 .

It is not a de Polignac number, because 68902145 - 2⁶ = 68902081 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61127 + ... + 62243.

It is an arithmetic number, because the mean of its divisors is an integer number (3784989).

Almost surely, 2^68902145 is an apocalyptic number.

68902145 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

68902145 is a deficient number, since it is larger than the sum of its proper divisors (21937591).

68902145 is a wasteful number, since it uses less digits than its factorization.

68902145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1208 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 68902145 is about 8300.7315942632. The cubic root of 68902145 is about 409.9626081307.

The spelling of 68902145 in words is "sixty-eight million, nine hundred two thousand, one hundred forty-five".