78161216 has 28 divisors (see below), whose sum is σ = 177259488. Its totient is φ = 33497472.

The previous prime is 78161207. The next prime is 78161219. The reversal of 78161216 is 61216187.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×78161216² = 12218351373197312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78161219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86786 + ... + 87681.

It is an arithmetic number, because the mean of its divisors is an integer number (6330696).

Almost surely, 2^78161216 is an apocalyptic number.

It is an amenable number.

78161216 is an abundant number, since it is smaller than the sum of its proper divisors (99098272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78161216 is a wasteful number, since it uses less digits than its factorization.

78161216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174486 (or 174476 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 78161216 is about 8840.8832137971. The cubic root of 78161216 is about 427.5600335194.

The spelling of 78161216 in words is "seventy-eight million, one hundred sixty-one thousand, two hundred sixteen".