1978706801 has 4 divisors (see below), whose sum is σ = 2046938100. Its totient is φ = 1910475504.

The previous prime is 1978706773. The next prime is 1978706819. The reversal of 1978706801 is 1086078791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1568239201 + 410467600 = 39601^2 + 20260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1978706801 - 2²² = 1974512497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978706861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34115606 + ... + 34115663.

It is an arithmetic number, because the mean of its divisors is an integer number (511734525).

Almost surely, 2^1978706801 is an apocalyptic number.

It is an amenable number.

1978706801 is a deficient number, since it is larger than the sum of its proper divisors (68231299).

1978706801 is an equidigital number, since it uses as much as digits as its factorization.

1978706801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68231298.

The product of its (nonzero) digits is 169344, while the sum is 47.

The square root of 1978706801 is about 44482.6573059659. The cubic root of 1978706801 is about 1255.4337957441.

The spelling of 1978706801 in words is "one billion, nine hundred seventy-eight million, seven hundred six thousand, eight hundred one".