1978275867 has 16 divisors (see below), whose sum is σ = 2672302080. Its totient is φ = 1301584032.

The previous prime is 1978275863. The next prime is 1978275869. The reversal of 1978275867 is 7685728791.

It is not a de Polignac number, because 1978275867 - 2² = 1978275863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1978275867.

It is not an unprimeable number, because it can be changed into a prime (1978275863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 267009 + ... + 274317.

It is an arithmetic number, because the mean of its divisors is an integer number (167018880).

Almost surely, 2^1978275867 is an apocalyptic number.

1978275867 is a deficient number, since it is larger than the sum of its proper divisors (694026213).

1978275867 is a wasteful number, since it uses less digits than its factorization.

1978275867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8482.

The product of its digits is 11854080, while the sum is 60.

The square root of 1978275867 is about 44477.8131993919. The cubic root of 1978275867 is about 1255.3426506274.

The spelling of 1978275867 in words is "one billion, nine hundred seventy-eight million, two hundred seventy-five thousand, eight hundred sixty-seven".