9509778840 has 128 divisors (see below), whose sum is σ = 29234856960. Its totient is φ = 2473595904.

The previous prime is 9509778823. The next prime is 9509778847. The reversal of 9509778840 is 488779059.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9509778847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1762627 + ... + 1768013.

It is an arithmetic number, because the mean of its divisors is an integer number (228397320).

Almost surely, 2^9509778840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9509778840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14617428480).

9509778840 is an abundant number, since it is smaller than the sum of its proper divisors (19725078120).

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

9509778840 is a wasteful number, since it uses less digits than its factorization.

9509778840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5761 (or 5757 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 57.

The square root of 9509778840 is about 97518.0949362732. The cubic root of 9509778840 is about 2118.6382348785.

The spelling of 9509778840 in words is "nine billion, five hundred nine million, seven hundred seventy-eight thousand, eight hundred forty".