78503693 has 2 divisors, whose sum is σ = 78503694. Its totient is φ = 78503692.

The previous prime is 78503651. The next prime is 78503717. The reversal of 78503693 is 39630587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75724804 + 2778889 = 8702^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 78503693 - 2²⁶ = 11394829 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78503693.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78502693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39251846 + 39251847.

It is an arithmetic number, because the mean of its divisors is an integer number (39251847).

Almost surely, 2^78503693 is an apocalyptic number.

It is an amenable number.

78503693 is a deficient number, since it is larger than the sum of its proper divisors (1).

78503693 is an equidigital number, since it uses as much as digits as its factorization.

78503693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 78503693 is about 8860.2309789305. The cubic root of 78503693 is about 428.1835999351.

The spelling of 78503693 in words is "seventy-eight million, five hundred three thousand, six hundred ninety-three".