636494460 has 96 divisors (see below), whose sum is σ = 2041536000. Its totient is φ = 145145088.

The previous prime is 636494429. The next prime is 636494477. The reversal of 636494460 is 64494636.

It is a super-2 number, since 2×636494460² = 810250395221383200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208062 + ... + 211098.

It is an arithmetic number, because the mean of its divisors is an integer number (21266000).

Almost surely, 2^636494460 is an apocalyptic number.

636494460 is a gapful number since it is divisible by the number (60) 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 636494460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1020768000).

636494460 is an abundant number, since it is smaller than the sum of its proper divisors (1405041540).

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

636494460 is a wasteful number, since it uses less digits than its factorization.

636494460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

The square root of 636494460 is about 25228.8418283519. The cubic root of 636494460 is about 860.1975659316.

The spelling of 636494460 in words is "six hundred thirty-six million, four hundred ninety-four thousand, four hundred sixty".