9129158820 has 72 divisors (see below), whose sum is σ = 28646687160. Its totient is φ = 2350494720.

The previous prime is 9129158789. The next prime is 9129158839. The reversal of 9129158820 is 288519219.

It can be written as a sum of positive squares in 4 ways, for example, as 77158656 + 9052000164 = 8784^2 + 95142^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 869221 + ... + 879660.

It is an arithmetic number, because the mean of its divisors is an integer number (397870655).

Almost surely, 2^9129158820 is an apocalyptic number.

9129158820 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9129158820 is an abundant number, since it is smaller than the sum of its proper divisors (19517528340).

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

9129158820 is a wasteful number, since it uses less digits than its factorization.

9129158820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748925 (or 1748920 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 9129158820 is about 95546.6316517751. The cubic root of 9129158820 is about 2089.9870133424.

The spelling of 9129158820 in words is "nine billion, one hundred twenty-nine million, one hundred fifty-eight thousand, eight hundred twenty".