68215810 has 32 divisors (see below), whose sum is σ = 136507392. Its totient is φ = 24373440.

The previous prime is 68215793. The next prime is 68215813. The reversal of 68215810 is 1851286.

It is a super-2 number, since 2×68215810² = 9306793467912200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (68215813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4434 + ... + 12493.

It is an arithmetic number, because the mean of its divisors is an integer number (4265856).

Almost surely, 2^68215810 is an apocalyptic number.

68215810 is an abundant number, since it is smaller than the sum of its proper divisors (68291582).

68215810 is a wasteful number, since it uses less digits than its factorization.

68215810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 68215810 is about 8259.2862887782. The cubic root of 68215810 is about 408.5968492947.

The spelling of 68215810 in words is "sixty-eight million, two hundred fifteen thousand, eight hundred ten".