78684772 has 24 divisors (see below), whose sum is σ = 150829560. Its totient is φ = 35750400.

The previous prime is 78684769. The next prime is 78684773. The reversal of 78684772 is 27748687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5308416 + 73376356 = 2304^2 + 8566^2 .

It is not an unprimeable number, because it can be changed into a prime (78684773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17979 + ... + 21922.

It is an arithmetic number, because the mean of its divisors is an integer number (6284565).

Almost surely, 2^78684772 is an apocalyptic number.

It is an amenable number.

78684772 is a deficient number, since it is larger than the sum of its proper divisors (72144788).

78684772 is a wasteful number, since it uses less digits than its factorization.

78684772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39951 (or 39949 counting only the distinct ones).

The product of its digits is 1053696, while the sum is 49.

The square root of 78684772 is about 8870.4437318547. The cubic root of 78684772 is about 428.5125675565.

It can be divided in two parts, 786 and 84772, that added together give a palindrome (85558).

The spelling of 78684772 in words is "seventy-eight million, six hundred eighty-four thousand, seven hundred seventy-two".