917428428820 has 24 divisors (see below), whose sum is σ = 2027999685600. Its totient is φ = 347657088672.

The previous prime is 917428428803. The next prime is 917428428821. The reversal of 917428428820 is 28824824719.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (917428428821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1207142290 + ... + 1207143049.

It is an arithmetic number, because the mean of its divisors is an integer number (84499986900).

Almost surely, 2^917428428820 is an apocalyptic number.

It is an amenable number.

917428428820 is an abundant number, since it is smaller than the sum of its proper divisors (1110571256780).

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

917428428820 is a wasteful number, since it uses less digits than its factorization.

917428428820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2414285367 (or 2414285365 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 55.

The spelling of 917428428820 in words is "nine hundred seventeen billion, four hundred twenty-eight million, four hundred twenty-eight thousand, eight hundred twenty".