1061115720 has 128 divisors (see below), whose sum is σ = 3666263040. Its totient is φ = 240664320.

The previous prime is 1061115719. The next prime is 1061115749. The reversal of 1061115720 is 275111601.

It is a super-2 number, since 2×1061115720² = 2251933142462236800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105219 + ... + 114861.

It is an arithmetic number, because the mean of its divisors is an integer number (28642680).

Almost surely, 2^1061115720 is an apocalyptic number.

1061115720 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 1061115720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1833131520).

1061115720 is an abundant number, since it is smaller than the sum of its proper divisors (2605147320).

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

1061115720 is a wasteful number, since it uses less digits than its factorization.

1061115720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9795 (or 9791 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 1061115720 is about 32574.7712194576. The cubic root of 1061115720 is about 1019.9704335913.

The spelling of 1061115720 in words is "one billion, sixty-one million, one hundred fifteen thousand, seven hundred twenty".