978776487 has 32 divisors (see below), whose sum is σ = 1564472000. Its totient is φ = 601209216.

The previous prime is 978776473. The next prime is 978776489. The reversal of 978776487 is 784677879.

978776487 is a `hidden beast` number, since 9 + 7 + 87 + 76 + 487 = 666.

It is not a de Polignac number, because 978776487 - 2¹⁸ = 978514343 is a prime.

It is a super-2 number, since 2×978776487² = 1916006823008122338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978776489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 212889 + ... + 217437.

It is an arithmetic number, because the mean of its divisors is an integer number (48889750).

Almost surely, 2^978776487 is an apocalyptic number.

978776487 is a deficient number, since it is larger than the sum of its proper divisors (585695513).

978776487 is a wasteful number, since it uses less digits than its factorization.

978776487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5184 (or 5178 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 63.

The square root of 978776487 is about 31285.4037372063. The cubic root of 978776487 is about 992.8748484582.

The spelling of 978776487 in words is "nine hundred seventy-eight million, seven hundred seventy-six thousand, four hundred eighty-seven".