72523557 has 12 divisors (see below), whose sum is σ = 106733484. Its totient is φ = 47436480.

The previous prime is 72523541. The next prime is 72523559. The reversal of 72523557 is 75532527.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49999041 + 22524516 = 7071^2 + 4746^2 .

It is not a de Polignac number, because 72523557 - 2⁴ = 72523541 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72523559) 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 11 ways as a sum of consecutive naturals, for example, 75544 + ... + 76497.

It is an arithmetic number, because the mean of its divisors is an integer number (8894457).

Almost surely, 2^72523557 is an apocalyptic number.

It is an amenable number.

72523557 is a deficient number, since it is larger than the sum of its proper divisors (34209927).

72523557 is a wasteful number, since it uses less digits than its factorization.

72523557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152100 (or 152097 counting only the distinct ones).

The product of its digits is 73500, while the sum is 36.

The square root of 72523557 is about 8516.0763852845. The cubic root of 72523557 is about 417.0227029028.

The spelling of 72523557 in words is "seventy-two million, five hundred twenty-three thousand, five hundred fifty-seven".