78253541 has 4 divisors (see below), whose sum is σ = 78280512. Its totient is φ = 78226572.

The previous prime is 78253537. The next prime is 78253547. The reversal of 78253541 is 14535287.

It is a happy number.

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 78253541 - 2² = 78253537 is a prime.

It is a super-2 number, since 2×78253541² = 12247233358077362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78253547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8525 + ... + 15138.

It is an arithmetic number, because the mean of its divisors is an integer number (19570128).

Almost surely, 2^78253541 is an apocalyptic number.

It is an amenable number.

78253541 is a deficient number, since it is larger than the sum of its proper divisors (26971).

78253541 is a wasteful number, since it uses less digits than its factorization.

78253541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26970.

The product of its digits is 33600, while the sum is 35.

The square root of 78253541 is about 8846.1031533665. The cubic root of 78253541 is about 427.7283136875.

The spelling of 78253541 in words is "seventy-eight million, two hundred fifty-three thousand, five hundred forty-one".