78706553 has 4 divisors (see below), whose sum is σ = 79815168. Its totient is φ = 77597940.

The previous prime is 78706547. The next prime is 78706561. The reversal of 78706553 is 35560787.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78706553 - 2¹⁴ = 78690169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78706553.

It is not an unprimeable number, because it can be changed into a prime (78706513) 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, 554201 + ... + 554342.

It is an arithmetic number, because the mean of its divisors is an integer number (19953792).

Almost surely, 2^78706553 is an apocalyptic number.

It is an amenable number.

78706553 is a deficient number, since it is larger than the sum of its proper divisors (1108615).

78706553 is a wasteful number, since it uses less digits than its factorization.

78706553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108614.

The product of its (nonzero) digits is 176400, while the sum is 41.

The square root of 78706553 is about 8871.6713757893. The cubic root of 78706553 is about 428.5521032503.

The spelling of 78706553 in words is "seventy-eight million, seven hundred six thousand, five hundred fifty-three".