640188548 has 12 divisors (see below), whose sum is σ = 1120750092. Its totient is φ = 319974240.

The previous prime is 640188539. The next prime is 640188583. The reversal of 640188548 is 845881046.

It can be written as a sum of positive squares in 2 ways, for example, as 580713604 + 59474944 = 24098^2 + 7712^2 .

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 640188499 and 640188508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17423 + ... + 39798.

It is an arithmetic number, because the mean of its divisors is an integer number (93395841).

Almost surely, 2^640188548 is an apocalyptic number.

It is an amenable number.

640188548 is a deficient number, since it is larger than the sum of its proper divisors (480561544).

640188548 is a wasteful number, since it uses less digits than its factorization.

640188548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60022 (or 60020 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The square root of 640188548 is about 25301.9475139761. The cubic root of 640188548 is about 861.8584956935.

It can be divided in two parts, 6401 and 88548, that added together give a palindrome (94949).

The spelling of 640188548 in words is "six hundred forty million, one hundred eighty-eight thousand, five hundred forty-eight".