31429660 has 48 divisors (see below), whose sum is σ = 68769792. Its totient is φ = 12052800.

The previous prime is 31429637. The next prime is 31429679. The reversal of 31429660 is 6692413.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100905 + ... + 101215.

It is an arithmetic number, because the mean of its divisors is an integer number (1432704).

It is a vampire number, since it can be written as 3260 ⋅ 9641 (with its own digits).

Almost surely, 2^31429660 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 31429660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34384896).

31429660 is an abundant number, since it is smaller than the sum of its proper divisors (37340132).

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

31429660 is a wasteful number, since it uses less digits than its factorization.

31429660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 31429660 is about 5606.2161927632. The cubic root of 31429660 is about 315.5827291689.

The spelling of 31429660 in words is "thirty-one million, four hundred twenty-nine thousand, six hundred sixty".