71399628 has 18 divisors (see below), whose sum is σ = 180482484. Its totient is φ = 23799864.

The previous prime is 71399623. The next prime is 71399633. The reversal of 71399628 is 82699317.

71399628 is a `hidden beast` number, since 7 + 13 + 9 + 9 + 628 = 666.

It is an interprime number because it is at equal distance from previous prime (71399623) and next prime (71399633).

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (71399623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 991626 + ... + 991697.

Almost surely, 2^71399628 is an apocalyptic number.

It is an amenable number.

71399628 is an abundant number, since it is smaller than the sum of its proper divisors (109082856).

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

71399628 is a wasteful number, since it uses less digits than its factorization.

71399628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983333 (or 1983328 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 71399628 is about 8449.8300574627. The cubic root of 71399628 is about 414.8572170535.

It can be divided in two parts, 71399 and 628, that added together give a palindrome (72027).

The spelling of 71399628 in words is "seventy-one million, three hundred ninety-nine thousand, six hundred twenty-eight".