78216650 has 24 divisors (see below), whose sum is σ = 145746624. Its totient is φ = 31230000.

The previous prime is 78216647. The next prime is 78216667. The reversal of 78216650 is 5661287.

It is a super-2 number, since 2×78216650² = 12235688674445000, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78216650.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36509 + ... + 38591.

It is an arithmetic number, because the mean of its divisors is an integer number (6072776).

Almost surely, 2^78216650 is an apocalyptic number.

78216650 is a deficient number, since it is larger than the sum of its proper divisors (67529974).

78216650 is a wasteful number, since it uses less digits than its factorization.

78216650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2846 (or 2841 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 78216650 is about 8844.0177521305. The cubic root of 78216650 is about 427.6610885912.

The spelling of 78216650 in words is "seventy-eight million, two hundred sixteen thousand, six hundred fifty".