72273535537 has 6 divisors (see below), whose sum is σ = 84073296498. Its totient is φ = 61948744704.

The previous prime is 72273535507. The next prime is 72273535547. The reversal of 72273535537 is 73553537227.

It can be written as a sum of positive squares in only one way, i.e., 61515904576 + 10757630961 = 248024^2 + 103719^2 .

It is not a de Polignac number, because 72273535537 - 2⁷ = 72273535409 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1474970113 = 72273535537 / (7 + 2 + 2 + 7 + 3 + 5 + 3 + 5 + 5 + 3 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72273535507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 737485008 + ... + 737485105.

It is an arithmetic number, because the mean of its divisors is an integer number (14012216083).

Almost surely, 2^72273535537 is an apocalyptic number.

It is an amenable number.

72273535537 is a deficient number, since it is larger than the sum of its proper divisors (11799760961).

72273535537 is a wasteful number, since it uses less digits than its factorization.

72273535537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474970127 (or 1474970120 counting only the distinct ones).

The product of its digits is 4630500, while the sum is 49.

The spelling of 72273535537 in words is "seventy-two billion, two hundred seventy-three million, five hundred thirty-five thousand, five hundred thirty-seven".