1206891720 has 48 divisors (see below), whose sum is σ = 3922399260. Its totient is φ = 321837696.

The previous prime is 1206891701. The next prime is 1206891731. The reversal of 1206891720 is 271986021.

It can be written as a sum of positive squares in 2 ways, for example, as 1136633796 + 70257924 = 33714^2 + 8382^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 1675879 + ... + 1676598.

Almost surely, 2^1206891720 is an apocalyptic number.

1206891720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1206891720 is an abundant number, since it is smaller than the sum of its proper divisors (2715507540).

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

1206891720 is a wasteful number, since it uses less digits than its factorization.

1206891720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352494 (or 3352487 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 1206891720 is about 34740.3471485246. The cubic root of 1206891720 is about 1064.6890052729.

The spelling of 1206891720 in words is "one billion, two hundred six million, eight hundred ninety-one thousand, seven hundred twenty".