78253229 has 4 divisors (see below), whose sum is σ = 82371840. Its totient is φ = 74134620.

The previous prime is 78253181. The next prime is 78253271. The reversal of 78253229 is 92235287.

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 78253229 - 2⁸ = 78252973 is a prime.

It is a super-2 number, since 2×78253229² = 12247135697852882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78253192 and 78253201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78253729) 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, 2059277 + ... + 2059314.

It is an arithmetic number, because the mean of its divisors is an integer number (20592960).

Almost surely, 2^78253229 is an apocalyptic number.

It is an amenable number.

78253229 is a deficient number, since it is larger than the sum of its proper divisors (4118611).

78253229 is a wasteful number, since it uses less digits than its factorization.

78253229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4118610.

The product of its digits is 60480, while the sum is 38.

The square root of 78253229 is about 8846.0855184652. The cubic root of 78253229 is about 427.7277452301.

The spelling of 78253229 in words is "seventy-eight million, two hundred fifty-three thousand, two hundred twenty-nine".