71538550 has 24 divisors (see below), whose sum is σ = 140890536. Its totient is φ = 26931840.

The previous prime is 71538527. The next prime is 71538557. The reversal of 71538550 is 5583517.

It is a super-2 number, since 2×71538550² = 10235528272205000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71538557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41232 + ... + 42931.

It is an arithmetic number, because the mean of its divisors is an integer number (5870439).

Almost surely, 2^71538550 is an apocalyptic number.

71538550 is a deficient number, since it is larger than the sum of its proper divisors (69351986).

71538550 is a wasteful number, since it uses less digits than its factorization.

71538550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84192 (or 84187 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 71538550 is about 8458.0464647577. The cubic root of 71538550 is about 415.1261048038.

The spelling of 71538550 in words is "seventy-one million, five hundred thirty-eight thousand, five hundred fifty".