73528021 has 16 divisors (see below), whose sum is σ = 87753600. Its totient is φ = 60274368.

The previous prime is 73528019. The next prime is 73528031. The reversal of 73528021 is 12082537.

It is not a de Polignac number, because 73528021 - 2¹ = 73528019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73528031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20466 + ... + 23788.

It is an arithmetic number, because the mean of its divisors is an integer number (5484600).

Almost surely, 2^73528021 is an apocalyptic number.

It is an amenable number.

73528021 is a deficient number, since it is larger than the sum of its proper divisors (14225579).

73528021 is a wasteful number, since it uses less digits than its factorization.

73528021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3468.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 73528021 is about 8574.8481619210. The cubic root of 73528021 is about 418.9391614076.

The spelling of 73528021 in words is "seventy-three million, five hundred twenty-eight thousand, twenty-one".