78111481 has 32 divisors (see below), whose sum is σ = 97880832. Its totient is φ = 60825600.

The previous prime is 78111479. The next prime is 78111493. The reversal of 78111481 is 18411187.

It is a cyclic number.

It is not a de Polignac number, because 78111481 - 2¹ = 78111479 is a prime.

It is a super-2 number, since 2×78111481² = 12202806928026722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78111461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 773331 + ... + 773431.

It is an arithmetic number, because the mean of its divisors is an integer number (3058776).

Almost surely, 2^78111481 is an apocalyptic number.

It is an amenable number.

78111481 is a deficient number, since it is larger than the sum of its proper divisors (19769351).

78111481 is a wasteful number, since it uses less digits than its factorization.

78111481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

The product of its digits is 1792, while the sum is 31.

The square root of 78111481 is about 8838.0699816193. The cubic root of 78111481 is about 427.4693269376.

The spelling of 78111481 in words is "seventy-eight million, one hundred eleven thousand, four hundred eighty-one".