68787869 has 4 divisors (see below), whose sum is σ = 69137244. Its totient is φ = 68438496.

The previous prime is 68787863. The next prime is 68787877. The reversal of 68787869 is 96878786.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96878786 = 2 ⋅48439393.

It can be written as a sum of positive squares in 2 ways, for example, as 41434969 + 27352900 = 6437^2 + 5230^2 .

It is a cyclic number.

It is not a de Polignac number, because 68787869 - 2¹⁶ = 68722333 is a prime.

It is a super-2 number, since 2×68787869² = 9463541843122322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68787863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174392 + ... + 174785.

It is an arithmetic number, because the mean of its divisors is an integer number (17284311).

Almost surely, 2^68787869 is an apocalyptic number.

It is an amenable number.

68787869 is a deficient number, since it is larger than the sum of its proper divisors (349375).

68787869 is a wasteful number, since it uses less digits than its factorization.

68787869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349374.

The product of its digits is 8128512, while the sum is 59.

The square root of 68787869 is about 8293.8452481343. The cubic root of 68787869 is about 409.7358381662.

The spelling of 68787869 in words is "sixty-eight million, seven hundred eighty-seven thousand, eight hundred sixty-nine".