978360781 has 4 divisors (see below), whose sum is σ = 978435964. Its totient is φ = 978285600.

The previous prime is 978360769. The next prime is 978360827. The reversal of 978360781 is 187063879.

978360781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is the 12770-th star number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 940648900 + 37711881 = 30670^2 + 6141^2 .

It is a cyclic number.

It is not a de Polignac number, because 978360781 - 2²⁵ = 944806349 is a prime.

It is a super-2 number, since 2×978360781² = 1914379635597859922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978360701) 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, 12480 + ... + 45961.

It is an arithmetic number, because the mean of its divisors is an integer number (244608991).

Almost surely, 2^978360781 is an apocalyptic number.

It is an amenable number.

978360781 is a deficient number, since it is larger than the sum of its proper divisors (75183).

978360781 is a wasteful number, since it uses less digits than its factorization.

978360781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75182.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 978360781 is about 31278.7592624771. The cubic root of 978360781 is about 992.7342639344.

The spelling of 978360781 in words is "nine hundred seventy-eight million, three hundred sixty thousand, seven hundred eighty-one".