645061434 has 16 divisors (see below), whose sum is σ = 1307796672. Its totient is φ = 212074848.

The previous prime is 645061433. The next prime is 645061451. The reversal of 645061434 is 434160546.

It is a super-2 number, since 2×645061434² = 832208507268272712, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645061395 and 645061404.

It is not an unprimeable number, because it can be changed into a prime (645061433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 735934 + ... + 736809.

It is an arithmetic number, because the mean of its divisors is an integer number (81737292).

Almost surely, 2^645061434 is an apocalyptic number.

645061434 is an abundant number, since it is smaller than the sum of its proper divisors (662735238).

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

645061434 is a wasteful number, since it uses less digits than its factorization.

645061434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1472821.

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

The square root of 645061434 is about 25398.0596502961. The cubic root of 645061434 is about 864.0396902849.

The spelling of 645061434 in words is "six hundred forty-five million, sixty-one thousand, four hundred thirty-four".