646261375 has 32 divisors (see below), whose sum is σ = 883509120. Its totient is φ = 469772800.

The previous prime is 646261373. The next prime is 646261391. The reversal of 646261375 is 573162646.

It is not a de Polignac number, because 646261375 - 2¹ = 646261373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646261373) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56382 + ... + 66868.

It is an arithmetic number, because the mean of its divisors is an integer number (27609660).

Almost surely, 2^646261375 is an apocalyptic number.

646261375 is a deficient number, since it is larger than the sum of its proper divisors (237247745).

646261375 is a wasteful number, since it uses less digits than its factorization.

646261375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10548 (or 10538 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The square root of 646261375 is about 25421.6713651955. The cubic root of 646261375 is about 864.5751196136.

The spelling of 646261375 in words is "six hundred forty-six million, two hundred sixty-one thousand, three hundred seventy-five".