645858246 has 64 divisors (see below), whose sum is σ = 1469767680. Its totient is φ = 187407360.

The previous prime is 645858233. The next prime is 645858251. The reversal of 645858246 is 642858546.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 645858195 and 645858204.

It is a congruent number.

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, 241750 + ... + 244406.

It is an arithmetic number, because the mean of its divisors is an integer number (22965120).

Almost surely, 2^645858246 is an apocalyptic number.

645858246 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 645858246, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734883840).

645858246 is an abundant number, since it is smaller than the sum of its proper divisors (823909434).

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

645858246 is a wasteful number, since it uses less digits than its factorization.

645858246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829.

The product of its digits is 1843200, while the sum is 48.

The square root of 645858246 is about 25413.7412830146. The cubic root of 645858246 is about 864.3953121794.

The spelling of 645858246 in words is "six hundred forty-five million, eight hundred fifty-eight thousand, two hundred forty-six".