78253911 has 16 divisors (see below), whose sum is σ = 117834720. Its totient is φ = 51312960.

The previous prime is 78253909. The next prime is 78253939. The reversal of 78253911 is 11935287.

It is not a de Polignac number, because 78253911 - 2¹ = 78253909 is a prime.

It is a super-2 number, since 2×78253911² = 12247349173591842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78253961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22110 + ... + 25403.

It is an arithmetic number, because the mean of its divisors is an integer number (7364670).

Almost surely, 2^78253911 is an apocalyptic number.

78253911 is a deficient number, since it is larger than the sum of its proper divisors (39580809).

78253911 is a wasteful number, since it uses less digits than its factorization.

78253911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47583 (or 47577 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 78253911 is about 8846.1240665051. The cubic root of 78253911 is about 427.7289878177.

The spelling of 78253911 in words is "seventy-eight million, two hundred fifty-three thousand, nine hundred eleven".