1091620736 has 64 divisors (see below), whose sum is σ = 2256811200. Its totient is φ = 525557760.

The previous prime is 1091620729. The next prime is 1091620759. The reversal of 1091620736 is 6370261901.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1091620696 and 1091620705.

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, 413276 + ... + 415908.

It is an arithmetic number, because the mean of its divisors is an integer number (35262675).

Almost surely, 2^1091620736 is an apocalyptic number.

1091620736 is a gapful number since it is divisible by the number (16) 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 1091620736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128405600).

1091620736 is an abundant number, since it is smaller than the sum of its proper divisors (1165190464).

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

1091620736 is an equidigital number, since it uses as much as digits as its factorization.

1091620736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767 (or 2755 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 1091620736 is about 33039.6842599926. The cubic root of 1091620736 is about 1029.6522959962.

The spelling of 1091620736 in words is "one billion, ninety-one million, six hundred twenty thousand, seven hundred thirty-six".