9978477644 has 12 divisors (see below), whose sum is σ = 18064485600. Its totient is φ = 4817196048.

The previous prime is 9978477643. The next prime is 9978477653. The reversal of 9978477644 is 4467748799.

It is not an unprimeable number, because it can be changed into a prime (9978477643) 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, 43010564 + ... + 43010795.

It is an arithmetic number, because the mean of its divisors is an integer number (1505373800).

Almost surely, 2^9978477644 is an apocalyptic number.

It is an amenable number.

9978477644 is a deficient number, since it is larger than the sum of its proper divisors (8086007956).

9978477644 is a wasteful number, since it uses less digits than its factorization.

9978477644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86021392 (or 86021390 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 65.

The square root of 9978477644 is about 99892.3302561313. The cubic root of 9978477644 is about 2152.8879628476.

The spelling of 9978477644 in words is "nine billion, nine hundred seventy-eight million, four hundred seventy-seven thousand, six hundred forty-four".