72771541 has 4 divisors (see below), whose sum is σ = 73235212. Its totient is φ = 72307872.

The previous prime is 72771499. The next prime is 72771551. The reversal of 72771541 is 14517727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49210225 + 23561316 = 7015^2 + 4854^2 .

It is a cyclic number.

It is not a de Polignac number, because 72771541 - 2⁹ = 72771029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72771497 and 72771506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72771551) 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, 231600 + ... + 231913.

It is an arithmetic number, because the mean of its divisors is an integer number (18308803).

Almost surely, 2^72771541 is an apocalyptic number.

It is an amenable number.

72771541 is a deficient number, since it is larger than the sum of its proper divisors (463671).

72771541 is a wasteful number, since it uses less digits than its factorization.

72771541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463670.

The product of its digits is 13720, while the sum is 34.

The square root of 72771541 is about 8530.6237169389. The cubic root of 72771541 is about 417.4974787996.

The spelling of 72771541 in words is "seventy-two million, seven hundred seventy-one thousand, five hundred forty-one".