78277212 has 96 divisors (see below), whose sum is σ = 220774400. Its totient is φ = 23841216.

The previous prime is 78277193. The next prime is 78277223. The reversal of 78277212 is 21277287.

It is a super-2 number, since 2×78277212² = 12254643836985888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178089 + ... + 178527.

Almost surely, 2^78277212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78277212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110387200).

78277212 is an abundant number, since it is smaller than the sum of its proper divisors (142497188).

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

78277212 is a wasteful number, since it uses less digits than its factorization.

78277212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 584 counting only the distinct ones).

The product of its digits is 21952, while the sum is 36.

The square root of 78277212 is about 8847.4409859575. The cubic root of 78277212 is about 427.7714373429.

The spelling of 78277212 in words is "seventy-eight million, two hundred seventy-seven thousand, two hundred twelve".