31840048 has 80 divisors (see below), whose sum is σ = 70575840. Its totient is φ = 13824000.

The previous prime is 31840013. The next prime is 31840049. The reversal of 31840048 is 84004813.

It is a junction number, because it is equal to n+sod(n) for n = 31839998 and 31840025.

It is not an unprimeable number, because it can be changed into a prime (31840049) 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, 315198 + ... + 315298.

It is an arithmetic number, because the mean of its divisors is an integer number (882198).

Almost surely, 2^31840048 is an apocalyptic number.

31840048 is a gapful number since it is divisible by the number (38) 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 31840048, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35287920).

31840048 is an abundant number, since it is smaller than the sum of its proper divisors (38735792).

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

31840048 is a wasteful number, since it uses less digits than its factorization.

31840048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 31840048 is about 5642.6986451520. The cubic root of 31840048 is about 316.9503516337.

The spelling of 31840048 in words is "thirty-one million, eight hundred forty thousand, forty-eight".