31402272 has 96 divisors (see below), whose sum is σ = 91010304. Its totient is φ = 9401600.

The previous prime is 31402271. The next prime is 31402279. The reversal of 31402272 is 27220413.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×31402272² = 1972205373523968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31402271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138223 + ... + 138449.

It is an arithmetic number, because the mean of its divisors is an integer number (948024).

Almost surely, 2^31402272 is an apocalyptic number.

31402272 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31402272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45505152).

31402272 is an abundant number, since it is smaller than the sum of its proper divisors (59608032).

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

31402272 is a wasteful number, since it uses less digits than its factorization.

31402272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 31402272 is about 5603.7730146750. The cubic root of 31402272 is about 315.4910356160.

Adding to 31402272 its reverse (27220413), we get a palindrome (58622685).

The spelling of 31402272 in words is "thirty-one million, four hundred two thousand, two hundred seventy-two".