78382516 has 6 divisors (see below), whose sum is σ = 137169410. Its totient is φ = 39191256.

The previous prime is 78382501. The next prime is 78382519. The reversal of 78382516 is 61528387.

It can be written as a sum of positive squares in only one way, i.e., 41731600 + 36650916 = 6460^2 + 6054^2 .

It is a super-2 number, since 2×78382516² = 12287637628980512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78382519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9797811 + ... + 9797818.

Almost surely, 2^78382516 is an apocalyptic number.

It is an amenable number.

78382516 is a deficient number, since it is larger than the sum of its proper divisors (58786894).

78382516 is a wasteful number, since it uses less digits than its factorization.

78382516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19595633 (or 19595631 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 78382516 is about 8853.3900851595. The cubic root of 78382516 is about 427.9631741105.

It can be divided in two parts, 783 and 82516, that multiplied together give a triangular number (64610028 = T₁₁₃₆₇).

The spelling of 78382516 in words is "seventy-eight million, three hundred eighty-two thousand, five hundred sixteen".