71507228 has 24 divisors (see below), whose sum is σ = 136286640. Its totient is φ = 32630400.

The previous prime is 71507221. The next prime is 71507251. The reversal of 71507228 is 82270517.

It is a super-2 number, since 2×71507228² = 10226567312487968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71507194 and 71507203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71507221) 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 7 ways as a sum of consecutive naturals, for example, 3098 + ... + 12353.

It is an arithmetic number, because the mean of its divisors is an integer number (5678610).

Almost surely, 2^71507228 is an apocalyptic number.

It is an amenable number.

71507228 is a deficient number, since it is larger than the sum of its proper divisors (64779412).

71507228 is a wasteful number, since it uses less digits than its factorization.

71507228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15557 (or 15555 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 71507228 is about 8456.1946524427. The cubic root of 71507228 is about 415.0655105369.

The spelling of 71507228 in words is "seventy-one million, five hundred seven thousand, two hundred twenty-eight".