78620537 has 16 divisors (see below), whose sum is σ = 86553600. Its totient is φ = 71124480.

The previous prime is 78620527. The next prime is 78620569. The reversal of 78620537 is 73502687.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 78620537 - 2⁶ = 78620473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78620537.

It is not an unprimeable number, because it can be changed into a prime (78620527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52712 + ... + 54182.

It is an arithmetic number, because the mean of its divisors is an integer number (5409600).

Almost surely, 2^78620537 is an apocalyptic number.

It is an amenable number.

78620537 is a deficient number, since it is larger than the sum of its proper divisors (7933063).

78620537 is a wasteful number, since it uses less digits than its factorization.

78620537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 78620537 is about 8866.8222605396. The cubic root of 78620537 is about 428.3959291536.

The spelling of 78620537 in words is "seventy-eight million, six hundred twenty thousand, five hundred thirty-seven".