78491964 has 24 divisors (see below), whose sum is σ = 192787840. Its totient is φ = 24786864.

The previous prime is 78491953. The next prime is 78491971. The reversal of 78491964 is 46919487.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171904 + ... + 172359.

Almost surely, 2^78491964 is an apocalyptic number.

It is an amenable number.

78491964 is an abundant number, since it is smaller than the sum of its proper divisors (114295876).

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

78491964 is a wasteful number, since it uses less digits than its factorization.

78491964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344289 (or 344287 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 78491964 is about 8859.5690640121. The cubic root of 78491964 is about 428.1622743329.

The spelling of 78491964 in words is "seventy-eight million, four hundred ninety-one thousand, nine hundred sixty-four".