729878021902 has 4 divisors (see below), whose sum is σ = 1094817032856. Its totient is φ = 364939010950.

The previous prime is 729878021857. The next prime is 729878021911. The reversal of 729878021902 is 209120878927.

729878021902 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 209120878927 = 119701 ⋅1747027.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 182469505474 + ... + 182469505477.

It is an arithmetic number, because the mean of its divisors is an integer number (273704258214).

Almost surely, 2^729878021902 is an apocalyptic number.

729878021902 is a deficient number, since it is larger than the sum of its proper divisors (364939010954).

729878021902 is a wasteful number, since it uses less digits than its factorization.

729878021902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364939010953.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The spelling of 729878021902 in words is "seven hundred twenty-nine billion, eight hundred seventy-eight million, twenty-one thousand, nine hundred two".