71520870 has 32 divisors (see below), whose sum is σ = 181748448. Its totient is φ = 17950208.

The previous prime is 71520859. The next prime is 71520871. The reversal of 71520870 is 7802517.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71520871) 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, 69609 + ... + 70628.

It is an arithmetic number, because the mean of its divisors is an integer number (5679639).

Almost surely, 2^71520870 is an apocalyptic number.

71520870 is an abundant number, since it is smaller than the sum of its proper divisors (110227578).

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

71520870 is a wasteful number, since it uses less digits than its factorization.

71520870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140264.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 71520870 is about 8457.0012415749. The cubic root of 71520870 is about 415.0919039697.

It can be divided in two parts, 71520 and 870, that added together give a triangular number (72390 = T₃₈₀).

The spelling of 71520870 in words is "seventy-one million, five hundred twenty thousand, eight hundred seventy".