72661630 has 8 divisors (see below), whose sum is σ = 130790952. Its totient is φ = 29064648.

The previous prime is 72661619. The next prime is 72661637. The reversal of 72661630 is 3616627.

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

It is a junction number, because it is equal to n+sod(n) for n = 72661592 and 72661601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72661637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3633072 + ... + 3633091.

It is an arithmetic number, because the mean of its divisors is an integer number (16348869).

Almost surely, 2^72661630 is an apocalyptic number.

72661630 is a deficient number, since it is larger than the sum of its proper divisors (58129322).

72661630 is a wasteful number, since it uses less digits than its factorization.

72661630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7266170.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 72661630 is about 8524.1791393659. The cubic root of 72661630 is about 417.2871828223.

The spelling of 72661630 in words is "seventy-two million, six hundred sixty-one thousand, six hundred thirty".