71505070 has 32 divisors (see below), whose sum is σ = 158413248. Its totient is φ = 22629888.

The previous prime is 71505067. The next prime is 71505079. The reversal of 71505070 is 7050517.

It is a super-2 number, since 2×71505070² = 10225950071409800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71505079) 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 15 ways as a sum of consecutive naturals, for example, 38379 + ... + 40198.

It is an arithmetic number, because the mean of its divisors is an integer number (4950414).

Almost surely, 2^71505070 is an apocalyptic number.

71505070 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

71505070 is an abundant number, since it is smaller than the sum of its proper divisors (86908178).

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

71505070 is a wasteful number, since it uses less digits than its factorization.

71505070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78604.

The product of its (nonzero) digits is 1225, while the sum is 25.

The square root of 71505070 is about 8456.0670527143. The cubic root of 71505070 is about 415.0613351064.

Adding to 71505070 its reverse (7050517), we get a palindrome (78555587).

The spelling of 71505070 in words is "seventy-one million, five hundred five thousand, seventy".