78669572 has 6 divisors (see below), whose sum is σ = 137671758. Its totient is φ = 39334784.

The previous prime is 78669571. The next prime is 78669581. The reversal of 78669572 is 27596687.

It can be written as a sum of positive squares in only one way, i.e., 58003456 + 20666116 = 7616^2 + 4546^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78669572.

It is not an unprimeable number, because it can be changed into a prime (78669571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9833693 + ... + 9833700.

It is an arithmetic number, because the mean of its divisors is an integer number (22945293).

Almost surely, 2^78669572 is an apocalyptic number.

It is an amenable number.

78669572 is a deficient number, since it is larger than the sum of its proper divisors (59002186).

78669572 is a wasteful number, since it uses less digits than its factorization.

78669572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19667397 (or 19667395 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 50.

The square root of 78669572 is about 8869.5869125907. The cubic root of 78669572 is about 428.4849730156.

The spelling of 78669572 in words is "seventy-eight million, six hundred sixty-nine thousand, five hundred seventy-two".