787878765 has 32 divisors (see below), whose sum is σ = 1402565760. Its totient is φ = 419634432.

The previous prime is 787878727. The next prime is 787878769. The reversal of 787878765 is 567878787.

787878765 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 787878765 - 2¹⁴ = 787862381 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (787878769) 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, 108117 + ... + 115173.

It is an arithmetic number, because the mean of its divisors is an integer number (43830180).

Almost surely, 2^787878765 is an apocalyptic number.

It is an amenable number.

787878765 is a deficient number, since it is larger than the sum of its proper divisors (614686995).

787878765 is a wasteful number, since it uses less digits than its factorization.

787878765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7898 (or 7892 counting only the distinct ones).

The product of its digits is 36879360, while the sum is 63.

The square root of 787878765 is about 28069.1782031466. The cubic root of 787878765 is about 923.6054036983.

The spelling of 787878765 in words is "seven hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred sixty-five".