72015538 has 8 divisors (see below), whose sum is σ = 123455232. Its totient is φ = 30863796.

The previous prime is 72015533. The next prime is 72015539. The reversal of 72015538 is 83551027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (72015533) 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, 2571970 + ... + 2571997.

It is an arithmetic number, because the mean of its divisors is an integer number (15431904).

Almost surely, 2^72015538 is an apocalyptic number.

72015538 is a deficient number, since it is larger than the sum of its proper divisors (51439694).

72015538 is a wasteful number, since it uses less digits than its factorization.

72015538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143976.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 72015538 is about 8486.1969102773. The cubic root of 72015538 is about 416.0466887009.

The spelling of 72015538 in words is "seventy-two million, fifteen thousand, five hundred thirty-eight".