72063921 has 8 divisors (see below), whose sum is σ = 97401760. Its totient is φ = 47384352.

The previous prime is 72063911. The next prime is 72063947. The reversal of 72063921 is 12936027.

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

It is not a de Polignac number, because 72063921 - 2¹³ = 72055729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72063911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164311 + ... + 164748.

It is an arithmetic number, because the mean of its divisors is an integer number (12175220).

Almost surely, 2^72063921 is an apocalyptic number.

It is an amenable number.

72063921 is a deficient number, since it is larger than the sum of its proper divisors (25337839).

72063921 is a wasteful number, since it uses less digits than its factorization.

72063921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329135.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 72063921 is about 8489.0471196713. The cubic root of 72063921 is about 416.1398402680.

Adding to 72063921 its reverse (12936027), we get a palindrome (84999948).

The spelling of 72063921 in words is "seventy-two million, sixty-three thousand, nine hundred twenty-one".