78328916 has 6 divisors (see below), whose sum is σ = 137075610. Its totient is φ = 39164456.

The previous prime is 78328907. The next prime is 78328919. The reversal of 78328916 is 61982387.

It can be written as a sum of positive squares in only one way, i.e., 66357316 + 11971600 = 8146^2 + 3460^2 .

It is a super-2 number, since 2×78328916² = 12270838163470112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78328919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9791111 + ... + 9791118.

It is an arithmetic number, because the mean of its divisors is an integer number (22845935).

Almost surely, 2^78328916 is an apocalyptic number.

It is an amenable number.

78328916 is a deficient number, since it is larger than the sum of its proper divisors (58746694).

78328916 is a wasteful number, since it uses less digits than its factorization.

78328916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19582233 (or 19582231 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 78328916 is about 8850.3624784525. The cubic root of 78328916 is about 427.8656010886.

The spelling of 78328916 in words is "seventy-eight million, three hundred twenty-eight thousand, nine hundred sixteen".