1981716270 has 32 divisors (see below), whose sum is σ = 4762506240. Its totient is φ = 527748000.

The previous prime is 1981716257. The next prime is 1981716301. The reversal of 1981716270 is 726171891.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21450 + ... + 66509.

It is an arithmetic number, because the mean of its divisors is an integer number (148828320).

Almost surely, 2^1981716270 is an apocalyptic number.

1981716270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1981716270 is an abundant number, since it is smaller than the sum of its proper divisors (2780789970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1981716270 is a wasteful number, since it uses less digits than its factorization.

1981716270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88720.

The product of its (nonzero) digits is 42336, while the sum is 42.

The square root of 1981716270 is about 44516.4718952435. The cubic root of 1981716270 is about 1256.0699478097.

The spelling of 1981716270 in words is "one billion, nine hundred eighty-one million, seven hundred sixteen thousand, two hundred seventy".