78683537 has 2 divisors, whose sum is σ = 78683538. Its totient is φ = 78683536.

The previous prime is 78683509. The next prime is 78683557. The reversal of 78683537 is 73538687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77281681 + 1401856 = 8791^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 78683537 - 2⁸ = 78683281 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 78683491 and 78683500.

It is not a weakly prime, because it can be changed into another prime (78683557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39341768 + 39341769.

It is an arithmetic number, because the mean of its divisors is an integer number (39341769).

Almost surely, 2^78683537 is an apocalyptic number.

It is an amenable number.

78683537 is a deficient number, since it is larger than the sum of its proper divisors (1).

78683537 is an equidigital number, since it uses as much as digits as its factorization.

78683537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 47.

The square root of 78683537 is about 8870.3741183785. The cubic root of 78683537 is about 428.5103256327.

The spelling of 78683537 in words is "seventy-eight million, six hundred eighty-three thousand, five hundred thirty-seven".