633530640 has 40 divisors (see below), whose sum is σ = 1963945728. Its totient is φ = 168941440.

The previous prime is 633530609. The next prime is 633530683. The reversal of 633530640 is 46035336.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×633530640² = 802722143637619200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 633530598 and 633530607.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1319616 + ... + 1320095.

Almost surely, 2^633530640 is an apocalyptic number.

633530640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

633530640 is an abundant number, since it is smaller than the sum of its proper divisors (1330415088).

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

633530640 is a wasteful number, since it uses less digits than its factorization.

633530640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639727 (or 2639721 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 30.

The square root of 633530640 is about 25170.0345649346. The cubic root of 633530640 is about 858.8603255937.

Adding to 633530640 its reverse (46035336), we get a palindrome (679565976).

The spelling of 633530640 in words is "six hundred thirty-three million, five hundred thirty thousand, six hundred forty".