71764638 has 32 divisors (see below), whose sum is σ = 158924160. Its totient is φ = 21420960.

The previous prime is 71764631. The next prime is 71764639. The reversal of 71764638 is 83646717.

It is a self number, because there is not a number n which added to its sum of digits gives 71764638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71764631) 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, 3693 + ... + 12536.

It is an arithmetic number, because the mean of its divisors is an integer number (4966380).

Almost surely, 2^71764638 is an apocalyptic number.

71764638 is an abundant number, since it is smaller than the sum of its proper divisors (87159522).

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

71764638 is a wasteful number, since it uses less digits than its factorization.

71764638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16312.

The product of its digits is 169344, while the sum is 42.

The square root of 71764638 is about 8471.4011828032. The cubic root of 71764638 is about 415.5629617242.

The spelling of 71764638 in words is "seventy-one million, seven hundred sixty-four thousand, six hundred thirty-eight".