1633542640 has 20 divisors (see below), whose sum is σ = 3797986824. Its totient is φ = 653417024.

The previous prime is 1633542619. The next prime is 1633542667. The reversal of 1633542640 is 462453361.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 1633542596 and 1633542605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10209562 + ... + 10209721.

Almost surely, 2^1633542640 is an apocalyptic number.

1633542640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1633542640 is an abundant number, since it is smaller than the sum of its proper divisors (2164444184).

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

1633542640 is a wasteful number, since it uses less digits than its factorization.

1633542640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20419296 (or 20419290 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 1633542640 is about 40417.1082587560. The cubic root of 1633542640 is about 1177.7239089585.

The spelling of 1633542640 in words is "one billion, six hundred thirty-three million, five hundred forty-two thousand, six hundred forty".