78538911 has 16 divisors (see below), whose sum is σ = 114386688. Its totient is φ = 47537600.

The previous prime is 78538891. The next prime is 78538919. The reversal of 78538911 is 11983587.

It is not a de Polignac number, because 78538911 - 2⁶ = 78538847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78538919) 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, 48070 + ... + 49676.

It is an arithmetic number, because the mean of its divisors is an integer number (7149168).

Almost surely, 2^78538911 is an apocalyptic number.

78538911 is a deficient number, since it is larger than the sum of its proper divisors (35847777).

78538911 is a wasteful number, since it uses less digits than its factorization.

78538911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3102.

The product of its digits is 60480, while the sum is 42.

The square root of 78538911 is about 8862.2181760550. The cubic root of 78538911 is about 428.2476203440.

The spelling of 78538911 in words is "seventy-eight million, five hundred thirty-eight thousand, nine hundred eleven".