71481618 has 24 divisors (see below), whose sum is σ = 166790988. Its totient is φ = 21994272.

The previous prime is 71481611. The next prime is 71481637. The reversal of 71481618 is 81618417.

It can be written as a sum of positive squares in 2 ways, for example, as 56295009 + 15186609 = 7503^2 + 3897^2 .

It is not an unprimeable number, because it can be changed into a prime (71481611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152505 + ... + 152972.

Almost surely, 2^71481618 is an apocalyptic number.

71481618 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

71481618 is an abundant number, since it is smaller than the sum of its proper divisors (95309370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71481618 is a wasteful number, since it uses less digits than its factorization.

71481618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305498 (or 305495 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 71481618 is about 8454.6802423273. The cubic root of 71481618 is about 415.0159533229.

The spelling of 71481618 in words is "seventy-one million, four hundred eighty-one thousand, six hundred eighteen".