72545549 has 4 divisors (see below), whose sum is σ = 74885760. Its totient is φ = 70205340.

The previous prime is 72545537. The next prime is 72545563. The reversal of 72545549 is 94554527.

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 72545549 - 2¹² = 72541453 is a prime.

It is a super-2 number, since 2×72545549² = 10525713359422802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72545509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1170059 + ... + 1170120.

It is an arithmetic number, because the mean of its divisors is an integer number (18721440).

Almost surely, 2^72545549 is an apocalyptic number.

It is an amenable number.

72545549 is a deficient number, since it is larger than the sum of its proper divisors (2340211).

72545549 is a wasteful number, since it uses less digits than its factorization.

72545549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340210.

The product of its digits is 252000, while the sum is 41.

The square root of 72545549 is about 8517.3674923652. The cubic root of 72545549 is about 417.0648512143.

The spelling of 72545549 in words is "seventy-two million, five hundred forty-five thousand, five hundred forty-nine".