68861815 has 32 divisors (see below), whose sum is σ = 97542144. Its totient is φ = 46103040.

The previous prime is 68861801. The next prime is 68861831. The reversal of 68861815 is 51816886.

It is a happy number.

It is not a de Polignac number, because 68861815 - 2²⁵ = 35307383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43162 + ... + 44728.

It is an arithmetic number, because the mean of its divisors is an integer number (3048192).

Almost surely, 2^68861815 is an apocalyptic number.

68861815 is a deficient number, since it is larger than the sum of its proper divisors (28680329).

68861815 is a wasteful number, since it uses less digits than its factorization.

68861815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647.

The product of its digits is 92160, while the sum is 43.

The square root of 68861815 is about 8298.3019347334. The cubic root of 68861815 is about 409.8826056920.

It can be divided in two parts, 68861 and 815, that multiplied together give a triangular number (56121715 = T₁₀₅₉₄).

The spelling of 68861815 in words is "sixty-eight million, eight hundred sixty-one thousand, eight hundred fifteen".