72520021067 has 8 divisors (see below), whose sum is σ = 78135509760. Its totient is φ = 66909821760.

The previous prime is 72520021061. The next prime is 72520021073. The reversal of 72520021067 is 76012002527.

It is an interprime number because it is at equal distance from previous prime (72520021061) and next prime (72520021073).

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

It is a cyclic number.

It is not a de Polignac number, because 72520021067 - 2²² = 72515826763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72520021061) 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 7 ways as a sum of consecutive naturals, for example, 1293842 + ... + 1348727.

It is an arithmetic number, because the mean of its divisors is an integer number (9766938720).

Almost surely, 2^72520021067 is an apocalyptic number.

72520021067 is a deficient number, since it is larger than the sum of its proper divisors (5615488693).

72520021067 is a wasteful number, since it uses less digits than its factorization.

72520021067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644693.

The product of its (nonzero) digits is 11760, while the sum is 32.

The spelling of 72520021067 in words is "seventy-two billion, five hundred twenty million, twenty-one thousand, sixty-seven".