1273201620 has 96 divisors (see below), whose sum is σ = 3765780480. Its totient is φ = 320906880.

The previous prime is 1273201619. The next prime is 1273201627. The reversal of 1273201620 is 261023721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273201627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72021 + ... + 87939.

It is an arithmetic number, because the mean of its divisors is an integer number (39226880).

Almost surely, 2^1273201620 is an apocalyptic number.

1273201620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1273201620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882890240).

1273201620 is an abundant number, since it is smaller than the sum of its proper divisors (2492578860).

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

1273201620 is a wasteful number, since it uses less digits than its factorization.

1273201620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16005 (or 16003 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 1273201620 is about 35681.9508995795. The cubic root of 1273201620 is about 1083.8413789588.

The spelling of 1273201620 in words is "one billion, two hundred seventy-three million, two hundred one thousand, six hundred twenty".