78236628 has 12 divisors (see below), whose sum is σ = 182552160. Its totient is φ = 26078872.

The previous prime is 78236617. The next prime is 78236629. The reversal of 78236628 is 82663287.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78236628² = 12241939921620768, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78236628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78236629) 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, 3259848 + ... + 3259871.

It is an arithmetic number, because the mean of its divisors is an integer number (15212680).

Almost surely, 2^78236628 is an apocalyptic number.

It is an amenable number.

78236628 is an abundant number, since it is smaller than the sum of its proper divisors (104315532).

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

78236628 is a wasteful number, since it uses less digits than its factorization.

78236628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6519726 (or 6519724 counting only the distinct ones).

The product of its digits is 193536, while the sum is 42.

The square root of 78236628 is about 8845.1471440559. The cubic root of 78236628 is about 427.6974963804.

The spelling of 78236628 in words is "seventy-eight million, two hundred thirty-six thousand, six hundred twenty-eight".