68821534 has 32 divisors (see below), whose sum is σ = 112412160. Its totient is φ = 31492800.

The previous prime is 68821531. The next prime is 68821537. The reversal of 68821534 is 43512886.

It is a happy number.

68821534 is nontrivially palindromic in base 9.

It is an interprime number because it is at equal distance from previous prime (68821531) and next prime (68821537).

It is a super-2 number, since 2×68821534² = 9472807084226312, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 68821493 and 68821502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68821531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253819 + ... + 254089.

It is an arithmetic number, because the mean of its divisors is an integer number (3512880).

Almost surely, 2^68821534 is an apocalyptic number.

68821534 is a deficient number, since it is larger than the sum of its proper divisors (43590626).

68821534 is a wasteful number, since it uses less digits than its factorization.

68821534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496.

The product of its digits is 46080, while the sum is 37.

The square root of 68821534 is about 8295.8745168909. The cubic root of 68821534 is about 409.8026692687.

It can be divided in two parts, 688 and 21534, that added together give a palindrome (22222).

The spelling of 68821534 in words is "sixty-eight million, eight hundred twenty-one thousand, five hundred thirty-four".