120820728447 has 24 divisors (see below), whose sum is σ = 175889121408. Its totient is φ = 79914978000.

The previous prime is 120820728439. The next prime is 120820728481. The reversal of 120820728447 is 744827028021.

120820728447 is a `hidden beast` number, since 120 + 8 + 207 + 284 + 47 = 666.

It is not a de Polignac number, because 120820728447 - 2³ = 120820728439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120820728437) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7715808 + ... + 7731450.

It is an arithmetic number, because the mean of its divisors is an integer number (7328713392).

Almost surely, 2^120820728447 is an apocalyptic number.

120820728447 is a deficient number, since it is larger than the sum of its proper divisors (55068392961).

120820728447 is a wasteful number, since it uses less digits than its factorization.

120820728447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22331 (or 22328 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 45.

The spelling of 120820728447 in words is "one hundred twenty billion, eight hundred twenty million, seven hundred twenty-eight thousand, four hundred forty-seven".