78641072 has 10 divisors (see below), whose sum is σ = 152367108. Its totient is φ = 39320528.

The previous prime is 78641051. The next prime is 78641077. The reversal of 78641072 is 27014687.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78641077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2457518 + ... + 2457549.

Almost surely, 2^78641072 is an apocalyptic number.

It is an amenable number.

78641072 is a deficient number, since it is larger than the sum of its proper divisors (73726036).

78641072 is a wasteful number, since it uses less digits than its factorization.

78641072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4915075 (or 4915069 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 78641072 is about 8867.9801533382. The cubic root of 78641072 is about 428.4332236695.

The spelling of 78641072 in words is "seventy-eight million, six hundred forty-one thousand, seventy-two".