72821428042 has 32 divisors (see below), whose sum is σ = 121836441600. Its totient is φ = 32359448880.

The previous prime is 72821428019. The next prime is 72821428051. The reversal of 72821428042 is 24082412827.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 72821427986 and 72821428004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877459 + ... + 956857.

It is an arithmetic number, because the mean of its divisors is an integer number (3807388800).

Almost surely, 2^72821428042 is an apocalyptic number.

72821428042 is a deficient number, since it is larger than the sum of its proper divisors (49015013558).

72821428042 is a wasteful number, since it uses less digits than its factorization.

72821428042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80346.

The product of its (nonzero) digits is 114688, while the sum is 40.

The spelling of 72821428042 in words is "seventy-two billion, eight hundred twenty-one million, four hundred twenty-eight thousand, forty-two".