78838557 has 16 divisors (see below), whose sum is σ = 120285312. Its totient is φ = 44994240.

The previous prime is 78838483. The next prime is 78838567. The reversal of 78838557 is 75583887.

It is a de Polignac number, because none of the positive numbers 2^k-78838557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78838567) 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, 19603 + ... + 23279.

It is an arithmetic number, because the mean of its divisors is an integer number (7517832).

Almost surely, 2^78838557 is an apocalyptic number.

It is an amenable number.

78838557 is a deficient number, since it is larger than the sum of its proper divisors (41446755).

78838557 is a wasteful number, since it uses less digits than its factorization.

78838557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4708.

The product of its digits is 1881600, while the sum is 51.

The square root of 78838557 is about 8879.1078943777. The cubic root of 78838557 is about 428.7915538552.

The spelling of 78838557 in words is "seventy-eight million, eight hundred thirty-eight thousand, five hundred fifty-seven".