68521554 has 24 divisors (see below), whose sum is σ = 154919232. Its totient is φ = 21847320.

The previous prime is 68521553. The next prime is 68521561. The reversal of 68521554 is 45512586.

68521554 is a `hidden beast` number, since 6 + 85 + 21 + 554 = 666.

It is not an unprimeable number, because it can be changed into a prime (68521553) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 82342 + ... + 83169.

It is an arithmetic number, because the mean of its divisors is an integer number (6454968).

Almost surely, 2^68521554 is an apocalyptic number.

68521554 is an abundant number, since it is smaller than the sum of its proper divisors (86397678).

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

68521554 is a wasteful number, since it uses less digits than its factorization.

68521554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165542 (or 165539 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The square root of 68521554 is about 8277.7747009689. The cubic root of 68521554 is about 409.2063847211.

The spelling of 68521554 in words is "sixty-eight million, five hundred twenty-one thousand, five hundred fifty-four".