31378896 has 30 divisors (see below), whose sum is σ = 87817730. Its totient is φ = 10459584.

The previous prime is 31378883. The next prime is 31378901. The reversal of 31378896 is 69887313.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20250000 + 11128896 = 4500^2 + 3336^2 .

It is a super-2 number, since 2×31378896² = 1969270228357632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 108811 + ... + 109098.

Almost surely, 2^31378896 is an apocalyptic number.

31378896 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31378896 is an abundant number, since it is smaller than the sum of its proper divisors (56438834).

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

31378896 is a wasteful number, since it uses less digits than its factorization.

31378896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217923 (or 217914 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 31378896 is about 5601.6868887863. The cubic root of 31378896 is about 315.4127318426.

The spelling of 31378896 in words is "thirty-one million, three hundred seventy-eight thousand, eight hundred ninety-six".