71761988 has 6 divisors (see below), whose sum is σ = 125583486. Its totient is φ = 35880992.

The previous prime is 71761973. The next prime is 71761999. The reversal of 71761988 is 88916717.

It can be written as a sum of positive squares in only one way, i.e., 48413764 + 23348224 = 6958^2 + 4832^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8970245 + ... + 8970252.

It is an arithmetic number, because the mean of its divisors is an integer number (20930581).

Almost surely, 2^71761988 is an apocalyptic number.

It is an amenable number.

71761988 is a deficient number, since it is larger than the sum of its proper divisors (53821498).

71761988 is a wasteful number, since it uses less digits than its factorization.

71761988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17940501 (or 17940499 counting only the distinct ones).

The product of its digits is 169344, while the sum is 47.

The square root of 71761988 is about 8471.2447727592. The cubic root of 71761988 is about 415.5578465986.

The spelling of 71761988 in words is "seventy-one million, seven hundred sixty-one thousand, nine hundred eighty-eight".