93221640 has 48 divisors (see below), whose sum is σ = 302971500. Its totient is φ = 24859008.

The previous prime is 93221621. The next prime is 93221641. The reversal of 93221640 is 4612239.

It can be written as a sum of positive squares in 2 ways, for example, as 92505924 + 715716 = 9618^2 + 846^2 .

It is not an unprimeable number, because it can be changed into a prime (93221641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129115 + ... + 129834.

Almost surely, 2^93221640 is an apocalyptic number.

93221640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

93221640 is an abundant number, since it is smaller than the sum of its proper divisors (209749860).

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

93221640 is a wasteful number, since it uses less digits than its factorization.

93221640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258966 (or 258959 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 93221640 is about 9655.1354211114. The cubic root of 93221640 is about 453.4251231858.

Adding to 93221640 its reverse (4612239), we get a palindrome (97833879).

The spelling of 93221640 in words is "ninety-three million, two hundred twenty-one thousand, six hundred forty".