645364104 has 128 divisors (see below), whose sum is σ = 2052864000. Its totient is φ = 167603520.

The previous prime is 645364091. The next prime is 645364117. The reversal of 645364104 is 401463546.

It is an interprime number because it is at equal distance from previous prime (645364091) and next prime (645364117).

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86989 + ... + 94115.

It is an arithmetic number, because the mean of its divisors is an integer number (16038000).

Almost surely, 2^645364104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645364104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1026432000).

645364104 is an abundant number, since it is smaller than the sum of its proper divisors (1407499896).

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

645364104 is a wasteful number, since it uses less digits than its factorization.

645364104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168 (or 7150 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 645364104 is about 25404.0174775566. The cubic root of 645364104 is about 864.1748081653.

The spelling of 645364104 in words is "six hundred forty-five million, three hundred sixty-four thousand, one hundred four".