31023104 has 56 divisors (see below), whose sum is σ = 71036688. Its totient is φ = 13271040.

The previous prime is 31023103. The next prime is 31023107. The reversal of 31023104 is 40132013.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023103) 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, 57074 + ... + 57614.

Almost surely, 2^31023104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31023104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35518344).

31023104 is an abundant number, since it is smaller than the sum of its proper divisors (40013584).

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

31023104 is an frugal number, since it uses more digits than its factorization.

31023104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 31023104 is about 5569.8387768409. The cubic root of 31023104 is about 314.2160872127.

Adding to 31023104 its reverse (40132013), we get a palindrome (71155117).

The spelling of 31023104 in words is "thirty-one million, twenty-three thousand, one hundred four".