31840628 has 6 divisors (see below), whose sum is σ = 55721106. Its totient is φ = 15920312.

The previous prime is 31840619. The next prime is 31840631. The reversal of 31840628 is 82604813.

It can be written as a sum of positive squares in only one way, i.e., 31832164 + 8464 = 5642^2 + 92^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31840594 and 31840603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3980075 + ... + 3980082.

It is an arithmetic number, because the mean of its divisors is an integer number (9286851).

Almost surely, 2^31840628 is an apocalyptic number.

It is an amenable number.

31840628 is a deficient number, since it is larger than the sum of its proper divisors (23880478).

31840628 is a wasteful number, since it uses less digits than its factorization.

31840628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7960161 (or 7960159 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 31840628 is about 5642.7500387666. The cubic root of 31840628 is about 316.9522761501.

The spelling of 31840628 in words is "thirty-one million, eight hundred forty thousand, six hundred twenty-eight".