72671817628 has 12 divisors (see below), whose sum is σ = 127188738432. Its totient is φ = 36332178080.

The previous prime is 72671817553. The next prime is 72671817667. The reversal of 72671817628 is 82671817627.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888625 + ... + 966952.

It is an arithmetic number, because the mean of its divisors is an integer number (10599061536).

Almost surely, 2^72671817628 is an apocalyptic number.

It is an amenable number.

72671817628 is a deficient number, since it is larger than the sum of its proper divisors (54516920804).

72671817628 is a wasteful number, since it uses less digits than its factorization.

72671817628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865372 (or 1865370 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 55.

Subtracting 72671817628 from its reverse (82671817627), we obtain a palindrome (9999999999).

The spelling of 72671817628 in words is "seventy-two billion, six hundred seventy-one million, eight hundred seventeen thousand, six hundred twenty-eight".