72013545 has 24 divisors (see below), whose sum is σ = 125630856. Its totient is φ = 38158848.

The previous prime is 72013531. The next prime is 72013559. The reversal of 72013545 is 54531027.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72013531) and next prime (72013559).

It can be written as a sum of positive squares in 4 ways, for example, as 7420176 + 64593369 = 2724^2 + 8037^2 .

It is not a de Polignac number, because 72013545 - 2⁸ = 72013289 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1969 + ... + 12161.

It is an arithmetic number, because the mean of its divisors is an integer number (5234619).

Almost surely, 2^72013545 is an apocalyptic number.

It is an amenable number.

72013545 is a deficient number, since it is larger than the sum of its proper divisors (53617311).

72013545 is a wasteful number, since it uses less digits than its factorization.

72013545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10361 (or 10358 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 72013545 is about 8486.0794834835. The cubic root of 72013545 is about 416.0428506926.

The spelling of 72013545 in words is "seventy-two million, thirteen thousand, five hundred forty-five".