1099432720 has 60 divisors (see below), whose sum is σ = 2697868620. Its totient is φ = 416616192.

The previous prime is 1099432699. The next prime is 1099432759. The reversal of 1099432720 is 272349901.

It can be written as a sum of positive squares in 2 ways, for example, as 547934464 + 551498256 = 23408^2 + 23484^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1099432720.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9846 + ... + 47914.

It is an arithmetic number, because the mean of its divisors is an integer number (44964477).

Almost surely, 2^1099432720 is an apocalyptic number.

1099432720 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 1099432720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1348934310).

1099432720 is an abundant number, since it is smaller than the sum of its proper divisors (1598435900).

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

1099432720 is a wasteful number, since it uses less digits than its factorization.

1099432720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38120 (or 38095 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 1099432720 is about 33157.6947328972. The cubic root of 1099432720 is about 1032.1026328631.

The spelling of 1099432720 in words is "one billion, ninety-nine million, four hundred thirty-two thousand, seven hundred twenty".