487428781921 has 9 divisors (see below), whose sum is σ = 489355591761. Its totient is φ = 485509537332.

The previous prime is 487428781901. The next prime is 487428782011. The reversal of 487428781921 is 129187824784.

The square root of 487428781921 is 698161.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-487428781921 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 487428781921.

It is not an unprimeable number, because it can be changed into a prime (487428781901) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 197578330 + ... + 197580796.

It is an arithmetic number, because the mean of its divisors is an integer number (54372843529).

Almost surely, 2^487428781921 is an apocalyptic number.

487428781921 is the 698161-st square number.

487428781921 is the 349081-st centered octagonal number.

It is an amenable number.

487428781921 is a deficient number, since it is larger than the sum of its proper divisors (1926809840).

487428781921 is an frugal number, since it uses more digits than its factorization.

487428781921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500 (or 2750 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 61.

The spelling of 487428781921 in words is "four hundred eighty-seven billion, four hundred twenty-eight million, seven hundred eighty-one thousand, nine hundred twenty-one".