9072640 has 52 divisors (see below), whose sum is σ = 21820824. Its totient is φ = 3620864.

The previous prime is 9072631. The next prime is 9072643. The reversal of 9072640 is 462709.

It is a junction number, because it is equal to n+sod(n) for n = 9072599 and 9072608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9072643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20259 + ... + 20701.

Almost surely, 2^9072640 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 9072640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10910412).

9072640 is an abundant number, since it is smaller than the sum of its proper divisors (12748184).

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

9072640 is an equidigital number, since it uses as much as digits as its factorization.

9072640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 9072640 is about 3012.0823361920. The cubic root of 9072640 is about 208.5665030246.

The spelling of 9072640 in words is "nine million, seventy-two thousand, six hundred forty".