1978806275 has 6 divisors (see below), whose sum is σ = 2453719812. Its totient is φ = 1583045000.

The previous prime is 1978806253. The next prime is 1978806343. The reversal of 1978806275 is 5726088791.

It is not a de Polignac number, because 1978806275 - 2⁸ = 1978806019 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39576101 + ... + 39576150.

It is an arithmetic number, because the mean of its divisors is an integer number (408953302).

Almost surely, 2^1978806275 is an apocalyptic number.

1978806275 is a deficient number, since it is larger than the sum of its proper divisors (474913537).

1978806275 is an equidigital number, since it uses as much as digits as its factorization.

1978806275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79152261 (or 79152256 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 53.

The square root of 1978806275 is about 44483.7754130649. The cubic root of 1978806275 is about 1255.4548332097.

The spelling of 1978806275 in words is "one billion, nine hundred seventy-eight million, eight hundred six thousand, two hundred seventy-five".