645061446 has 48 divisors (see below), whose sum is σ = 1446642288. Its totient is φ = 207590400.

The previous prime is 645061433. The next prime is 645061451. The reversal of 645061446 is 644160546.

645061446 is a `hidden beast` number, since 6 + 4 + 506 + 144 + 6 = 666.

It is a super-2 number, since 2×645061446² = 832208538231221832, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 645061446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67081 + ... + 76091.

It is an arithmetic number, because the mean of its divisors is an integer number (30138381).

Almost surely, 2^645061446 is an apocalyptic number.

645061446 is an abundant number, since it is smaller than the sum of its proper divisors (801580842).

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

645061446 is a wasteful number, since it uses less digits than its factorization.

645061446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9157 (or 9154 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 645061446 is about 25398.0598865346. The cubic root of 645061446 is about 864.0396956428.

It can be divided in two parts, 6450 and 61446, that added together give a triangular number (67896 = T₃₆₈).

The spelling of 645061446 in words is "six hundred forty-five million, sixty-one thousand, four hundred forty-six".