645127342 has 16 divisors (see below), whose sum is σ = 987299280. Its totient is φ = 316044352.

The previous prime is 645127337. The next prime is 645127363. The reversal of 645127342 is 243721546.

It is a junction number, because it is equal to n+sod(n) for n = 645127298 and 645127307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81993 + ... + 89515.

It is an arithmetic number, because the mean of its divisors is an integer number (61706205).

Almost surely, 2^645127342 is an apocalyptic number.

645127342 is a deficient number, since it is larger than the sum of its proper divisors (342171938).

645127342 is a wasteful number, since it uses less digits than its factorization.

645127342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387.

The product of its digits is 40320, while the sum is 34.

The square root of 645127342 is about 25399.3571178485. The cubic root of 645127342 is about 864.0691165201.

Adding to 645127342 its reverse (243721546), we get a palindrome (888848888).

The spelling of 645127342 in words is "six hundred forty-five million, one hundred twenty-seven thousand, three hundred forty-two".