56781285 has 64 divisors (see below), whose sum is σ = 104011776. Its totient is φ = 26208000.

The previous prime is 56781281. The next prime is 56781313. The reversal of 56781285 is 58218765.

It is not a de Polignac number, because 56781285 - 2² = 56781281 is a prime.

It is a super-2 number, since 2×56781285² = 6448228652502450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56781281) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 375960 + ... + 376110.

It is an arithmetic number, because the mean of its divisors is an integer number (1625184).

Almost surely, 2^56781285 is an apocalyptic number.

56781285 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56781285 is a deficient number, since it is larger than the sum of its proper divisors (47230491).

56781285 is a wasteful number, since it uses less digits than its factorization.

56781285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266.

The product of its digits is 134400, while the sum is 42.

The square root of 56781285 is about 7535.3357589427. The cubic root of 56781285 is about 384.3572453958.

The spelling of 56781285 in words is "fifty-six million, seven hundred eighty-one thousand, two hundred eighty-five".