71497728 has 120 divisors (see below), whose sum is σ = 214053840. Its totient is φ = 23777280.

The previous prime is 71497667. The next prime is 71497729. The reversal of 71497728 is 82779417.

It is a happy number.

It is a super-2 number, since 2×71497728² = 10223850218323968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71497729) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 165673 + ... + 166103.

It is an arithmetic number, because the mean of its divisors is an integer number (1783782).

Almost surely, 2^71497728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71497728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107026920).

71497728 is an abundant number, since it is smaller than the sum of its proper divisors (142556112).

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

71497728 is an equidigital number, since it uses as much as digits as its factorization.

71497728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465 (or 436 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 71497728 is about 8455.6329154002. The cubic root of 71497728 is about 415.0471287262.

The spelling of 71497728 in words is "seventy-one million, four hundred ninety-seven thousand, seven hundred twenty-eight".