72663646 has 24 divisors (see below), whose sum is σ = 120341592. Its totient is φ = 32881200.

The previous prime is 72663637. The next prime is 72663649. The reversal of 72663646 is 64636627.

It is a junction number, because it is equal to n+sod(n) for n = 72663599 and 72663608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72663649) 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, 67956 + ... + 69016.

It is an arithmetic number, because the mean of its divisors is an integer number (5014233).

Almost surely, 2^72663646 is an apocalyptic number.

72663646 is a deficient number, since it is larger than the sum of its proper divisors (47677946).

72663646 is a wasteful number, since it uses less digits than its factorization.

72663646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368 (or 1357 counting only the distinct ones).

The product of its digits is 217728, while the sum is 40.

The square root of 72663646 is about 8524.2973904012. The cubic root of 72663646 is about 417.2910420035.

The spelling of 72663646 in words is "seventy-two million, six hundred sixty-three thousand, six hundred forty-six".