497791939890 has 128 divisors (see below), whose sum is σ = 1396431249408. Its totient is φ = 111199737600.

The previous prime is 497791939873. The next prime is 497791939891. The reversal of 497791939890 is 98939197794.

It is not an unprimeable number, because it can be changed into a prime (497791939891) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6882897 + ... + 6954843.

It is an arithmetic number, because the mean of its divisors is an integer number (10909619136).

Almost surely, 2^497791939890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 497791939890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698215624704).

497791939890 is an abundant number, since it is smaller than the sum of its proper divisors (898639309518).

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

497791939890 is a wasteful number, since it uses less digits than its factorization.

497791939890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72712.

The product of its (nonzero) digits is 277766496, while the sum is 75.

The spelling of 497791939890 in words is "four hundred ninety-seven billion, seven hundred ninety-one million, nine hundred thirty-nine thousand, eight hundred ninety".