72321501 has 12 divisors (see below), whose sum is σ = 112172352. Its totient is φ = 41326488.

The previous prime is 72321497. The next prime is 72321503. The reversal of 72321501 is 10512327.

It is not a de Polignac number, because 72321501 - 2² = 72321497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72321503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245845 + ... + 246138.

It is an arithmetic number, because the mean of its divisors is an integer number (9347696).

Almost surely, 2^72321501 is an apocalyptic number.

It is an amenable number.

72321501 is a deficient number, since it is larger than the sum of its proper divisors (39850851).

72321501 is a wasteful number, since it uses less digits than its factorization.

72321501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492000 (or 491993 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 72321501 is about 8504.2049011063. The cubic root of 72321501 is about 416.6350572999.

Adding to 72321501 its reverse (10512327), we get a palindrome (82833828).

The spelling of 72321501 in words is "seventy-two million, three hundred twenty-one thousand, five hundred one".