645113436 has 36 divisors (see below), whose sum is σ = 1654550856. Its totient is φ = 195488480.

The previous prime is 645113431. The next prime is 645113449. The reversal of 645113436 is 634311546.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 645113397 and 645113406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645113431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220695 + ... + 223598.

It is an arithmetic number, because the mean of its divisors is an integer number (45959746).

Almost surely, 2^645113436 is an apocalyptic number.

645113436 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

645113436 is an abundant number, since it is smaller than the sum of its proper divisors (1009437420).

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

645113436 is a wasteful number, since it uses less digits than its factorization.

645113436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444322 (or 444309 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 645113436 is about 25399.0833692872. The cubic root of 645113436 is about 864.0629080139.

The spelling of 645113436 in words is "six hundred forty-five million, one hundred thirteen thousand, four hundred thirty-six".