2978728901 has 2 divisors, whose sum is σ = 2978728902. Its totient is φ = 2978728900.

The previous prime is 2978728877. The next prime is 2978728931. The reversal of 2978728901 is 1098278792.

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., 1695298276 + 1283430625 = 41174^2 + 35825^2 .

It is a cyclic number.

It is not a de Polignac number, because 2978728901 - 2¹⁰ = 2978727877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2978728931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1489364450 + 1489364451.

It is an arithmetic number, because the mean of its divisors is an integer number (1489364451).

Almost surely, 2^2978728901 is an apocalyptic number.

It is an amenable number.

2978728901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2978728901 is an equidigital number, since it uses as much as digits as its factorization.

2978728901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 2978728901 is about 54577.7326480315. The cubic root of 2978728901 is about 1438.8327895299.

The spelling of 2978728901 in words is "two billion, nine hundred seventy-eight million, seven hundred twenty-eight thousand, nine hundred one".