1206553520 has 80 divisors (see below), whose sum is σ = 2842987680. Its totient is φ = 476178432.

The previous prime is 1206553483. The next prime is 1206553559. The reversal of 1206553520 is 253556021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

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, 3101486 + ... + 3101874.

It is an arithmetic number, because the mean of its divisors is an integer number (35537346).

Almost surely, 2^1206553520 is an apocalyptic number.

1206553520 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 1206553520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1421493840).

1206553520 is an abundant number, since it is smaller than the sum of its proper divisors (1636434160).

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

1206553520 is a wasteful number, since it uses less digits than its factorization.

1206553520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 1206553520 is about 34735.4792683216. The cubic root of 1206553520 is about 1064.5895455188.

The spelling of 1206553520 in words is "one billion, two hundred six million, five hundred fifty-three thousand, five hundred twenty".