2175883978 has 24 divisors (see below), whose sum is σ = 3391872588. Its totient is φ = 1046817408.

The previous prime is 2175883967. The next prime is 2175883987. The reversal of 2175883978 is 8793885712.

It can be written as a sum of positive squares in 6 ways, for example, as 657768609 + 1518115369 = 25647^2 + 38963^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 524400 + ... + 528532.

Almost surely, 2^2175883978 is an apocalyptic number.

2175883978 is a deficient number, since it is larger than the sum of its proper divisors (1215988610).

2175883978 is a wasteful number, since it uses less digits than its factorization.

2175883978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4506 (or 4477 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 58.

The square root of 2175883978 is about 46646.3715416323. The cubic root of 2175883978 is about 1295.8216890820.

The spelling of 2175883978 in words is "two billion, one hundred seventy-five million, eight hundred eighty-three thousand, nine hundred seventy-eight".