9781461978 has 16 divisors (see below), whose sum is σ = 19566888096. Its totient is φ = 3259826640.

The previous prime is 9781461973. The next prime is 9781461979. The reversal of 9781461978 is 8791641879.

It is not an unprimeable number, because it can be changed into a prime (9781461971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132601 + ... + 192732.

It is an arithmetic number, because the mean of its divisors is an integer number (1222930506).

Almost surely, 2^9781461978 is an apocalyptic number.

9781461978 is an abundant number, since it is smaller than the sum of its proper divisors (9785426118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9781461978 is a wasteful number, since it uses less digits than its factorization.

9781461978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330349.

The product of its digits is 6096384, while the sum is 60.

The square root of 9781461978 is about 98901.2738947280. The cubic root of 9781461978 is about 2138.6247589697.

The spelling of 9781461978 in words is "nine billion, seven hundred eighty-one million, four hundred sixty-one thousand, nine hundred seventy-eight".