645828547 has 16 divisors (see below), whose sum is σ = 797766592. Its totient is φ = 509120640.

The previous prime is 645828541. The next prime is 645828577. The reversal of 645828547 is 745828546.

It is not a de Polignac number, because 645828547 - 2³ = 645828539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645828547.

It is not an unprimeable number, because it can be changed into a prime (645828541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12397 + ... + 38017.

It is an arithmetic number, because the mean of its divisors is an integer number (49860412).

Almost surely, 2^645828547 is an apocalyptic number.

645828547 is a deficient number, since it is larger than the sum of its proper divisors (151938045).

645828547 is a wasteful number, since it uses less digits than its factorization.

645828547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25918.

The product of its digits is 2150400, while the sum is 49.

The square root of 645828547 is about 25413.1569664219. The cubic root of 645828547 is about 864.3820625899.

Subtracting 645828547 from its reverse (745828546), we obtain a palindrome (99999999).

The spelling of 645828547 in words is "six hundred forty-five million, eight hundred twenty-eight thousand, five hundred forty-seven".