840732645 has 16 divisors (see below), whose sum is σ = 1353744000. Its totient is φ = 445533504.

The previous prime is 840732631. The next prime is 840732677. The reversal of 840732645 is 546237048.

It is a happy number.

It is not a de Polignac number, because 840732645 - 2¹⁰ = 840731621 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176145 + ... + 180854.

It is an arithmetic number, because the mean of its divisors is an integer number (84609000).

Almost surely, 2^840732645 is an apocalyptic number.

It is an amenable number.

840732645 is a deficient number, since it is larger than the sum of its proper divisors (513011355).

840732645 is a wasteful number, since it uses less digits than its factorization.

840732645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357164.

The product of its (nonzero) digits is 161280, while the sum is 39.

The square root of 840732645 is about 28995.3900646292. The cubic root of 840732645 is about 943.8130334052.

The spelling of 840732645 in words is "eight hundred forty million, seven hundred thirty-two thousand, six hundred forty-five".