645452214 has 16 divisors (see below), whose sum is σ = 1408259520. Its totient is φ = 195591560.

The previous prime is 645452201. The next prime is 645452219. The reversal of 645452214 is 412254546.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645452219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4889724 + ... + 4889855.

It is an arithmetic number, because the mean of its divisors is an integer number (88016220).

Almost surely, 2^645452214 is an apocalyptic number.

645452214 is an abundant number, since it is smaller than the sum of its proper divisors (762807306).

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

645452214 is a wasteful number, since it uses less digits than its factorization.

645452214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9779595.

The product of its digits is 38400, while the sum is 33.

The square root of 645452214 is about 25405.7515928972. The cubic root of 645452214 is about 864.2141342744.

The spelling of 645452214 in words is "six hundred forty-five million, four hundred fifty-two thousand, two hundred fourteen".