78494649472 has 32 divisors (see below), whose sum is σ = 157425601500. Its totient is φ = 38983910400.

The previous prime is 78494649461. The next prime is 78494649503. The reversal of 78494649472 is 27494649487.

It can be written as a sum of positive squares in 2 ways, for example, as 77315139136 + 1179510336 = 278056^2 + 34344^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×78494649472² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2038779 + ... + 2076922.

Almost surely, 2^78494649472 is an apocalyptic number.

It is an amenable number.

78494649472 is an abundant number, since it is smaller than the sum of its proper divisors (78930952028).

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

78494649472 is a wasteful number, since it uses less digits than its factorization.

78494649472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115864 (or 4115852 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 64.

The spelling of 78494649472 in words is "seventy-eight billion, four hundred ninety-four million, six hundred forty-nine thousand, four hundred seventy-two".