491978901464 has 32 divisors (see below), whose sum is σ = 959167785600. Its totient is φ = 236316668160.

The previous prime is 491978901439. The next prime is 491978901487. The reversal of 491978901464 is 464109879194.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a junction number, because it is equal to n+sod(n) for n = 491978901397 and 491978901406.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7206119 + ... + 7274070.

It is an arithmetic number, because the mean of its divisors is an integer number (29973993300).

Almost surely, 2^491978901464 is an apocalyptic number.

It is an amenable number.

491978901464 is a deficient number, since it is larger than the sum of its proper divisors (467188884136).

491978901464 is a wasteful number, since it uses less digits than its factorization.

491978901464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14480363 (or 14480359 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 62.

The spelling of 491978901464 in words is "four hundred ninety-one billion, nine hundred seventy-eight million, nine hundred one thousand, four hundred sixty-four".