78538011 has 8 divisors (see below), whose sum is σ = 110877264. Its totient is φ = 49278720.

The previous prime is 78538007. The next prime is 78538043. The reversal of 78538011 is 11083587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78538011 - 2² = 78538007 is a prime.

It is a super-2 number, since 2×78538011² = 12336438343672242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78538091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 769930 + ... + 770031.

It is an arithmetic number, because the mean of its divisors is an integer number (13859658).

Almost surely, 2^78538011 is an apocalyptic number.

78538011 is a deficient number, since it is larger than the sum of its proper divisors (32339253).

78538011 is a wasteful number, since it uses less digits than its factorization.

78538011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539981.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 78538011 is about 8862.1673985544. The cubic root of 78538011 is about 428.2459845335.

The spelling of 78538011 in words is "seventy-eight million, five hundred thirty-eight thousand, eleven".