56721067 has 4 divisors (see below), whose sum is σ = 61084240. Its totient is φ = 52357896.

The previous prime is 56721047. The next prime is 56721109. The reversal of 56721067 is 76012765.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76012765 = 5 ⋅15202553.

It is a cyclic number.

It is not a de Polignac number, because 56721067 - 2¹⁵ = 56688299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56721017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2181567 + ... + 2181592.

It is an arithmetic number, because the mean of its divisors is an integer number (15271060).

Almost surely, 2^56721067 is an apocalyptic number.

56721067 is a deficient number, since it is larger than the sum of its proper divisors (4363173).

56721067 is a wasteful number, since it uses less digits than its factorization.

56721067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4363172.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 56721067 is about 7531.3389911755. The cubic root of 56721067 is about 384.2213237832.

The spelling of 56721067 in words is "fifty-six million, seven hundred twenty-one thousand, sixty-seven".