87878765 has 8 divisors (see below), whose sum is σ = 113566488. Its totient is φ = 64895040.

The previous prime is 87878761. The next prime is 87878773. The reversal of 87878765 is 56787878.

87878765 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 13557124 + 74321641 = 3682^2 + 8621^2 .

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

It is not a de Polignac number, because 87878765 - 2² = 87878761 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87878765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87878761) 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, 675926 + ... + 676055.

It is an arithmetic number, because the mean of its divisors is an integer number (14195811).

Almost surely, 2^87878765 is an apocalyptic number.

It is an amenable number.

87878765 is a deficient number, since it is larger than the sum of its proper divisors (25687723).

87878765 is a wasteful number, since it uses less digits than its factorization.

87878765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1351999.

The product of its digits is 5268480, while the sum is 56.

The square root of 87878765 is about 9374.3674453266. The cubic root of 87878765 is about 444.5916634632.

The spelling of 87878765 in words is "eighty-seven million, eight hundred seventy-eight thousand, seven hundred sixty-five".