27878980901 has 8 divisors (see below), whose sum is σ = 30536815320. Its totient is φ = 25334245888.

The previous prime is 27878980879. The next prime is 27878980933. The reversal of 27878980901 is 10908987872.

It is a Cunningham number, because it is equal to 166970²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 14619228100 + 13259752801 = 120910^2 + 115151^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 27878980901 - 2⁶ = 27878980837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27878980981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28274336 + ... + 28275321.

It is an arithmetic number, because the mean of its divisors is an integer number (3817101915).

Almost surely, 2^27878980901 is an apocalyptic number.

It is an amenable number.

27878980901 is a deficient number, since it is larger than the sum of its proper divisors (2657834419).

27878980901 is a wasteful number, since it uses less digits than its factorization.

27878980901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56549703.

The product of its (nonzero) digits is 4064256, while the sum is 59.

The spelling of 27878980901 in words is "twenty-seven billion, eight hundred seventy-eight million, nine hundred eighty thousand, nine hundred one".