71427690 has 64 divisors (see below), whose sum is σ = 191963520. Its totient is φ = 18898560.

The previous prime is 71427683. The next prime is 71427691. The reversal of 71427690 is 9672417.

It is a happy number.

It is a super-2 number, since 2×71427690² = 10203829797472200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71427691) 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, 36025 + ... + 37955.

It is an arithmetic number, because the mean of its divisors is an integer number (2999430).

Almost surely, 2^71427690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71427690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95981760).

71427690 is an abundant number, since it is smaller than the sum of its proper divisors (120535830).

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

71427690 is a wasteful number, since it uses less digits than its factorization.

71427690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2084 (or 2078 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 71427690 is about 8451.4904011068. The cubic root of 71427690 is about 414.9115599995.

The spelling of 71427690 in words is "seventy-one million, four hundred twenty-seven thousand, six hundred ninety".