1091436768 has 60 divisors (see below), whose sum is σ = 3209892840. Its totient is φ = 363811392.

The previous prime is 1091436763. The next prime is 1091436781. The reversal of 1091436768 is 8676341901.

It is a happy number.

It is a super-3 number, since 3×1091436768³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091436763) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 207948 + ... + 213131.

It is an arithmetic number, because the mean of its divisors is an integer number (53498214).

Almost surely, 2^1091436768 is an apocalyptic number.

1091436768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1091436768 is an abundant number, since it is smaller than the sum of its proper divisors (2118456072).

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

1091436768 is an equidigital number, since it uses as much as digits as its factorization.

1091436768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421101 (or 421084 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1091436768 is about 33036.9000967100. The cubic root of 1091436768 is about 1029.5944512065.

The spelling of 1091436768 in words is "one billion, ninety-one million, four hundred thirty-six thousand, seven hundred sixty-eight".