1653802640 has 40 divisors (see below), whose sum is σ = 4394391360. Its totient is φ = 567017856.

The previous prime is 1653802613. The next prime is 1653802643. The reversal of 1653802640 is 462083561.

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

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1653802640.

It is not an unprimeable number, because it can be changed into a prime (1653802643) by changing a digit.

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, 1476050 + ... + 1477169.

It is an arithmetic number, because the mean of its divisors is an integer number (109859784).

Almost surely, 2^1653802640 is an apocalyptic number.

1653802640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1653802640 is an abundant number, since it is smaller than the sum of its proper divisors (2740588720).

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

1653802640 is a wasteful number, since it uses less digits than its factorization.

1653802640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953239 (or 2953233 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1653802640 is about 40666.9723485779. The cubic root of 1653802640 is about 1182.5728215683.

The spelling of 1653802640 in words is "one billion, six hundred fifty-three million, eight hundred two thousand, six hundred forty".