31320642 has 8 divisors (see below), whose sum is σ = 62641296. Its totient is φ = 10440212.

The previous prime is 31320637. The next prime is 31320643. The reversal of 31320642 is 24602313.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

31320642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (31320643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2610048 + ... + 2610059.

It is an arithmetic number, because the mean of its divisors is an integer number (7830162).

Almost surely, 2^31320642 is an apocalyptic number.

31320642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31320642 is a wasteful number, since it uses less digits than its factorization.

31320642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5220112.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 31320642 is about 5596.4847895800. The cubic root of 31320642 is about 315.2174261046.

Adding to 31320642 its reverse (24602313), we get a palindrome (55922955).

The spelling of 31320642 in words is "thirty-one million, three hundred twenty thousand, six hundred forty-two".