78641536 has 16 divisors (see below), whose sum is σ = 156668940. Its totient is φ = 39320704.

The previous prime is 78641509. The next prime is 78641561. The reversal of 78641536 is 63514687.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307066 + ... + 307321.

Almost surely, 2^78641536 is an apocalyptic number.

It is an amenable number.

78641536 is a deficient number, since it is larger than the sum of its proper divisors (78027404).

78641536 is an equidigital number, since it uses as much as digits as its factorization.

78641536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614401 (or 614389 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 78641536 is about 8868.0063148376. The cubic root of 78641536 is about 428.4340662853.

The spelling of 78641536 in words is "seventy-eight million, six hundred forty-one thousand, five hundred thirty-six".