78509803 has 2 divisors, whose sum is σ = 78509804. Its totient is φ = 78509802.

The previous prime is 78509797. The next prime is 78509807. The reversal of 78509803 is 30890587.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78509803 - 2¹⁷ = 78378731 is a prime.

It is not a weakly prime, because it can be changed into another prime (78509807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39254901 + 39254902.

It is an arithmetic number, because the mean of its divisors is an integer number (39254902).

Almost surely, 2^78509803 is an apocalyptic number.

78509803 is a deficient number, since it is larger than the sum of its proper divisors (1).

78509803 is an equidigital number, since it uses as much as digits as its factorization.

78509803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 78509803 is about 8860.5757713593. The cubic root of 78509803 is about 428.1947082615.

The spelling of 78509803 in words is "seventy-eight million, five hundred nine thousand, eight hundred three".