247987978 has 32 divisors (see below), whose sum is σ = 447068160. Its totient is φ = 100866480.

The previous prime is 247987973. The next prime is 247988017. The reversal of 247987978 is 879789742.

It is a super-2 number, since 2×247987978² = 122996074465056968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (247987973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39243 + ... + 45121.

It is an arithmetic number, because the mean of its divisors is an integer number (13970880).

Almost surely, 2^247987978 is an apocalyptic number.

247987978 is a deficient number, since it is larger than the sum of its proper divisors (199080182).

247987978 is a wasteful number, since it uses less digits than its factorization.

247987978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042.

The product of its digits is 14224896, while the sum is 61.

The square root of 247987978 is about 15747.6340445160. The cubic root of 247987978 is about 628.2659782502.

The spelling of 247987978 in words is "two hundred forty-seven million, nine hundred eighty-seven thousand, nine hundred seventy-eight".