497661840 has 320 divisors, whose sum is σ = 1899878400. Its totient is φ = 118941696.

The previous prime is 497661823. The next prime is 497661841. The reversal of 497661840 is 48166794.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (497661841) 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, 1038721 + ... + 1039199.

It is an arithmetic number, because the mean of its divisors is an integer number (5937120).

Almost surely, 2^497661840 is an apocalyptic number.

497661840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 497661840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949939200).

497661840 is an abundant number, since it is smaller than the sum of its proper divisors (1402216560).

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

497661840 is a wasteful number, since it uses less digits than its factorization.

497661840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 497661840 is about 22308.3356618104. The cubic root of 497661840 is about 792.4613932305.

It can be divided in two parts, 497661 and 840, that added together give a triangular number (498501 = T₉₉₈).

The spelling of 497661840 in words is "four hundred ninety-seven million, six hundred sixty-one thousand, eight hundred forty".