2870728921 has 2 divisors, whose sum is σ = 2870728922. Its totient is φ = 2870728920.

The previous prime is 2870728901. The next prime is 2870728963. The reversal of 2870728921 is 1298270782.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2064793600 + 805935321 = 45440^2 + 28389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2870728921 - 2¹³ = 2870720729 is a prime.

It is not a weakly prime, because it can be changed into another prime (2870728901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1435364460 + 1435364461.

It is an arithmetic number, because the mean of its divisors is an integer number (1435364461).

Almost surely, 2^2870728921 is an apocalyptic number.

It is an amenable number.

2870728921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2870728921 is an equidigital number, since it uses as much as digits as its factorization.

2870728921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 2870728921 is about 53579.1836537288. The cubic root of 2870728921 is about 1421.2290029482.

The spelling of 2870728921 in words is "two billion, eight hundred seventy million, seven hundred twenty-eight thousand, nine hundred twenty-one".