78520737 has 8 divisors (see below), whose sum is σ = 108071680. Its totient is φ = 50658480.

The previous prime is 78520727. The next prime is 78520759. The reversal of 78520737 is 73702587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78520737 - 2⁷ = 78520609 is a prime.

It is a super-2 number, since 2×78520737² = 12331012278046338, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78520695 and 78520704.

It is not an unprimeable number, because it can be changed into a prime (78520727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422062 + ... + 422247.

It is an arithmetic number, because the mean of its divisors is an integer number (13508960).

Almost surely, 2^78520737 is an apocalyptic number.

It is an amenable number.

78520737 is a deficient number, since it is larger than the sum of its proper divisors (29550943).

78520737 is a wasteful number, since it uses less digits than its factorization.

78520737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844343.

The product of its (nonzero) digits is 82320, while the sum is 39.

The square root of 78520737 is about 8861.1927526716. The cubic root of 78520737 is about 428.2145854548.

The spelling of 78520737 in words is "seventy-eight million, five hundred twenty thousand, seven hundred thirty-seven".