78780253 has 4 divisors (see below), whose sum is σ = 78824188. Its totient is φ = 78736320.

The previous prime is 78780241. The next prime is 78780263. The reversal of 78780253 is 35208787.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43520409 + 35259844 = 6597^2 + 5938^2 .

It is a cyclic number.

It is not a de Polignac number, because 78780253 - 2¹³ = 78772061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78780203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19158 + ... + 22903.

It is an arithmetic number, because the mean of its divisors is an integer number (19706047).

Almost surely, 2^78780253 is an apocalyptic number.

It is an amenable number.

78780253 is a deficient number, since it is larger than the sum of its proper divisors (43935).

78780253 is a wasteful number, since it uses less digits than its factorization.

78780253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43934.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 78780253 is about 8875.8240744170. The cubic root of 78780253 is about 428.6858254353.

The spelling of 78780253 in words is "seventy-eight million, seven hundred eighty thousand, two hundred fifty-three".