72556773 has 4 divisors (see below), whose sum is σ = 96742368. Its totient is φ = 48371180.

The previous prime is 72556769. The next prime is 72556819. The reversal of 72556773 is 37765527.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72556773 - 2² = 72556769 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72556723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12092793 + ... + 12092798.

It is an arithmetic number, because the mean of its divisors is an integer number (24185592).

Almost surely, 2^72556773 is an apocalyptic number.

It is an amenable number.

72556773 is a deficient number, since it is larger than the sum of its proper divisors (24185595).

72556773 is a wasteful number, since it uses less digits than its factorization.

72556773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24185594.

The product of its digits is 308700, while the sum is 42.

The square root of 72556773 is about 8518.0263559113. The cubic root of 72556773 is about 417.0863590558.

It can be divided in two parts, 7255 and 6773, that added together give a triangular number (14028 = T₁₆₇).

The spelling of 72556773 in words is "seventy-two million, five hundred fifty-six thousand, seven hundred seventy-three".