72445821 has 8 divisors (see below), whose sum is σ = 110393664. Its totient is φ = 41397600.

The previous prime is 72445817. The next prime is 72445829. The reversal of 72445821 is 12854427.

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

It is not a de Polignac number, because 72445821 - 2² = 72445817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72445829) 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, 1724880 + ... + 1724921.

It is an arithmetic number, because the mean of its divisors is an integer number (13799208).

Almost surely, 2^72445821 is an apocalyptic number.

It is an amenable number.

72445821 is a deficient number, since it is larger than the sum of its proper divisors (37947843).

72445821 is a wasteful number, since it uses less digits than its factorization.

72445821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3449811.

The product of its digits is 17920, while the sum is 33.

The square root of 72445821 is about 8511.5110879326. The cubic root of 72445821 is about 416.8736512585.

The spelling of 72445821 in words is "seventy-two million, four hundred forty-five thousand, eight hundred twenty-one".