817420540 has 48 divisors (see below), whose sum is σ = 1760220000. Its totient is φ = 318689280.

The previous prime is 817420519. The next prime is 817420543. The reversal of 817420540 is 45024718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817420543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 653836 + ... + 655084.

It is an arithmetic number, because the mean of its divisors is an integer number (36671250).

Almost surely, 2^817420540 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 817420540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880110000).

817420540 is an abundant number, since it is smaller than the sum of its proper divisors (942799460).

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

817420540 is a wasteful number, since it uses less digits than its factorization.

817420540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2062 (or 2060 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 817420540 is about 28590.5673256058. The cubic root of 817420540 is about 935.0076886515.

The spelling of 817420540 in words is "eight hundred seventeen million, four hundred twenty thousand, five hundred forty".