78520072 has 16 divisors (see below), whose sum is σ = 148880700. Its totient is φ = 38818560.

The previous prime is 78520061. The next prime is 78520073. The reversal of 78520072 is 27002587.

It can be written as a sum of positive squares in 2 ways, for example, as 72692676 + 5827396 = 8526^2 + 2414^2 .

It is not an unprimeable number, because it can be changed into a prime (78520073) 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, 54429 + ... + 55852.

Almost surely, 2^78520072 is an apocalyptic number.

It is an amenable number.

78520072 is a deficient number, since it is larger than the sum of its proper divisors (70360628).

78520072 is a wasteful number, since it uses less digits than its factorization.

78520072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110376 (or 110372 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 78520072 is about 8861.1552294269. The cubic root of 78520072 is about 428.2133765873.

The spelling of 78520072 in words is "seventy-eight million, five hundred twenty thousand, seventy-two".