978257486761 has 9 divisors (see below), whose sum is σ = 1022663460189. Its totient is φ = 935702793036.

The previous prime is 978257486753. The next prime is 978257486819. The reversal of 978257486761 is 167684752879.

The square root of 978257486761 is 989069.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 978257486761 - 2³ = 978257486753 is a prime.

It is a super-2 number, since 2×978257486761² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978257486711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22727086 + ... + 22770088.

Almost surely, 2^978257486761 is an apocalyptic number.

978257486761 is the 989069-th square number.

978257486761 is the 494535-th centered octagonal number.

It is an amenable number.

978257486761 is a deficient number, since it is larger than the sum of its proper divisors (44405973428).

978257486761 is an frugal number, since it uses more digits than its factorization.

978257486761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86052 (or 43026 counting only the distinct ones).

The product of its digits is 284497920, while the sum is 70.

The spelling of 978257486761 in words is "nine hundred seventy-eight billion, two hundred fifty-seven million, four hundred eighty-six thousand, seven hundred sixty-one".