1231552720 has 40 divisors (see below), whose sum is σ = 2878387200. Its totient is φ = 490035840.

The previous prime is 1231552681. The next prime is 1231552739. The reversal of 1231552720 is 272551321.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25020 + ... + 55579.

It is an arithmetic number, because the mean of its divisors is an integer number (71959680).

Almost surely, 2^1231552720 is an apocalyptic number.

1231552720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231552720 is an abundant number, since it is smaller than the sum of its proper divisors (1646834480).

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

1231552720 is a wasteful number, since it uses less digits than its factorization.

1231552720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80803 (or 80797 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 1231552720 is about 35093.4854353340. The cubic root of 1231552720 is about 1071.8919333033.

The spelling of 1231552720 in words is "one billion, two hundred thirty-one million, five hundred fifty-two thousand, seven hundred twenty".