31780641 has 8 divisors (see below), whose sum is σ = 44216640. Its totient is φ = 20265872.

The previous prime is 31780627. The next prime is 31780643. The reversal of 31780641 is 14608713.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31780641 - 2⁶ = 31780577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31780599 and 31780608.

It is not an unprimeable number, because it can be changed into a prime (31780643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230226 + ... + 230363.

It is an arithmetic number, because the mean of its divisors is an integer number (5527080).

Almost surely, 2^31780641 is an apocalyptic number.

It is an amenable number.

31780641 is a deficient number, since it is larger than the sum of its proper divisors (12435999).

31780641 is a wasteful number, since it uses less digits than its factorization.

31780641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460615.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 31780641 is about 5637.4321281945. The cubic root of 31780641 is about 316.7531074577.

The spelling of 31780641 in words is "thirty-one million, seven hundred eighty thousand, six hundred forty-one".