56783621 has 8 divisors (see below), whose sum is σ = 60263640. Its totient is φ = 53319168.

The previous prime is 56783611. The next prime is 56783627. The reversal of 56783621 is 12638765.

56783621 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in 4 ways, for example, as 24453025 + 32330596 = 4945^2 + 5686^2 .

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 56783621 - 2¹⁰ = 56782597 is a prime.

It is a super-2 number, since 2×56783621² = 6448759227743282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56783627) 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, 4115 + ... + 11423.

It is an arithmetic number, because the mean of its divisors is an integer number (7532955).

Almost surely, 2^56783621 is an apocalyptic number.

It is an amenable number.

56783621 is a deficient number, since it is larger than the sum of its proper divisors (3480019).

56783621 is a wasteful number, since it uses less digits than its factorization.

56783621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7783.

The product of its digits is 60480, while the sum is 38.

The square root of 56783621 is about 7535.4907603951. The cubic root of 56783621 is about 384.3625161830.

The spelling of 56783621 in words is "fifty-six million, seven hundred eighty-three thousand, six hundred twenty-one".