87878789 has 8 divisors (see below), whose sum is σ = 89589120. Its totient is φ = 86175936.

The previous prime is 87878783. The next prime is 87878807. The reversal of 87878789 is 98787878.

87878789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87878789 - 2⁴ = 87878773 is a prime.

It is a super-2 number, since 2×87878789² = 15445363112213042, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87878783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25709 + ... + 28925.

It is an arithmetic number, because the mean of its divisors is an integer number (11198640).

Almost surely, 2^87878789 is an apocalyptic number.

It is an amenable number.

87878789 is a deficient number, since it is larger than the sum of its proper divisors (1710331).

87878789 is a wasteful number, since it uses less digits than its factorization.

87878789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739.

The product of its digits is 12644352, while the sum is 62.

The square root of 87878789 is about 9374.3687254129. The cubic root of 87878789 is about 444.5917039364.

It can be divided in two parts, 8787 and 8789, that added together give a cube (17576 = 26³).

The spelling of 87878789 in words is "eighty-seven million, eight hundred seventy-eight thousand, seven hundred eighty-nine".