645026238620 has 48 divisors (see below), whose sum is σ = 1399142578176. Its totient is φ = 249528264000.

The previous prime is 645026238611. The next prime is 645026238629. The reversal of 645026238620 is 26832620546.

It is an interprime number because it is at equal distance from previous prime (645026238611) and next prime (645026238629).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645026238629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 642905 + ... + 1305135.

It is an arithmetic number, because the mean of its divisors is an integer number (29148803712).

Almost surely, 2^645026238620 is an apocalyptic number.

It is an amenable number.

645026238620 is an abundant number, since it is smaller than the sum of its proper divisors (754116339556).

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

645026238620 is a wasteful number, since it uses less digits than its factorization.

645026238620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663842 (or 663840 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 645026238620 in words is "six hundred forty-five billion, twenty-six million, two hundred thirty-eight thousand, six hundred twenty".