650618538 has 16 divisors (see below), whose sum is σ = 1346107680. Its totient is φ = 209394416.

The previous prime is 650618537. The next prime is 650618557. The reversal of 650618538 is 835816056.

It is a self number, because there is not a number n which added to its sum of digits gives 650618538.

It is not an unprimeable number, because it can be changed into a prime (650618533) 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, 1869420 + ... + 1869767.

It is an arithmetic number, because the mean of its divisors is an integer number (84131730).

Almost surely, 2^650618538 is an apocalyptic number.

650618538 is an abundant number, since it is smaller than the sum of its proper divisors (695489142).

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

650618538 is a wasteful number, since it uses less digits than its factorization.

650618538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739221.

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 650618538 is about 25507.2252116925. The cubic root of 650618538 is about 866.5137883859.

It can be divided in two parts, 650618 and 538, that added together give a palindrome (651156).

The spelling of 650618538 in words is "six hundred fifty million, six hundred eighteen thousand, five hundred thirty-eight".