1653640220 has 24 divisors (see below), whose sum is σ = 3474051504. Its totient is φ = 661188096.

The previous prime is 1653640213. The next prime is 1653640231. The reversal of 1653640220 is 220463561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38252 + ... + 69068.

It is an arithmetic number, because the mean of its divisors is an integer number (144752146).

Almost surely, 2^1653640220 is an apocalyptic number.

1653640220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1653640220 is an abundant number, since it is smaller than the sum of its proper divisors (1820411284).

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

1653640220 is a wasteful number, since it uses less digits than its factorization.

1653640220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33509 (or 33507 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 1653640220 is about 40664.9753473428. The cubic root of 1653640220 is about 1182.5341067984.

The spelling of 1653640220 in words is "one billion, six hundred fifty-three million, six hundred forty thousand, two hundred twenty".