68428815 has 32 divisors (see below), whose sum is σ = 134754816. Its totient is φ = 28874880.

The previous prime is 68428793. The next prime is 68428819. The reversal of 68428815 is 51882486.

It is not a de Polignac number, because 68428815 - 2¹¹ = 68426767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68428819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23701 + ... + 26430.

It is an arithmetic number, because the mean of its divisors is an integer number (4211088).

Almost surely, 2^68428815 is an apocalyptic number.

68428815 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

68428815 is a deficient number, since it is larger than the sum of its proper divisors (66326001).

68428815 is a wasteful number, since it uses less digits than its factorization.

68428815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50159.

The product of its digits is 122880, while the sum is 42.

The square root of 68428815 is about 8272.1711176692. The cubic root of 68428815 is about 409.0216908928.

The spelling of 68428815 in words is "sixty-eight million, four hundred twenty-eight thousand, eight hundred fifteen".