2856378987 has 48 divisors (see below), whose sum is σ = 5253460992. Its totient is φ = 1452245760.

The previous prime is 2856378961. The next prime is 2856378991. The reversal of 2856378987 is 7898736582.

It is not a de Polignac number, because 2856378987 - 2⁶ = 2856378923 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (2856378887) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11278 + ... + 76419.

It is an arithmetic number, because the mean of its divisors is an integer number (109447104).

Almost surely, 2^2856378987 is an apocalyptic number.

2856378987 is a deficient number, since it is larger than the sum of its proper divisors (2397082005).

2856378987 is a wasteful number, since it uses less digits than its factorization.

2856378987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87768 (or 87765 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 63.

The square root of 2856378987 is about 53445.1025539291. The cubic root of 2856378987 is about 1418.8569434752.

The spelling of 2856378987 in words is "two billion, eight hundred fifty-six million, three hundred seventy-eight thousand, nine hundred eighty-seven".