78530953 has 2 divisors, whose sum is σ = 78530954. Its totient is φ = 78530952.

The previous prime is 78530941. The next prime is 78530999. The reversal of 78530953 is 35903587.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47927929 + 30603024 = 6923^2 + 5532^2 .

It is a cyclic number.

It is not a de Polignac number, because 78530953 - 2²⁵ = 44976521 is a prime.

It is a super-2 number, since 2×78530953² = 12334221158176418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78530923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39265476 + 39265477.

It is an arithmetic number, because the mean of its divisors is an integer number (39265477).

Almost surely, 2^78530953 is an apocalyptic number.

It is an amenable number.

78530953 is a deficient number, since it is larger than the sum of its proper divisors (1).

78530953 is an equidigital number, since it uses as much as digits as its factorization.

78530953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 78530953 is about 8861.7691800227. The cubic root of 78530953 is about 428.2331557106.

The spelling of 78530953 in words is "seventy-eight million, five hundred thirty thousand, nine hundred fifty-three".