56781381 has 8 divisors (see below), whose sum is σ = 76026240. Its totient is φ = 37695392.

The previous prime is 56781359. The next prime is 56781383. The reversal of 56781381 is 18318765.

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 56781381 - 2⁶ = 56781317 is a prime.

It is a super-2 number, since 2×56781381² = 6448250456534322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56781383) 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, 38880 + ... + 40313.

It is an arithmetic number, because the mean of its divisors is an integer number (9503280).

Almost surely, 2^56781381 is an apocalyptic number.

It is an amenable number.

56781381 is a deficient number, since it is larger than the sum of its proper divisors (19244859).

56781381 is a wasteful number, since it uses less digits than its factorization.

56781381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79435.

The product of its digits is 40320, while the sum is 39.

The square root of 56781381 is about 7535.3421289282. The cubic root of 56781381 is about 384.3574620063.

The spelling of 56781381 in words is "fifty-six million, seven hundred eighty-one thousand, three hundred eighty-one".