71742540 has 24 divisors (see below), whose sum is σ = 200879280. Its totient is φ = 19131328.

The previous prime is 71742529. The next prime is 71742547. The reversal of 71742540 is 4524717.

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

It is a junction number, because it is equal to n+sod(n) for n = 71742498 and 71742507.

It is not an unprimeable number, because it can be changed into a prime (71742547) 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, 597795 + ... + 597914.

It is an arithmetic number, because the mean of its divisors is an integer number (8369970).

Almost surely, 2^71742540 is an apocalyptic number.

It is an amenable number.

71742540 is an abundant number, since it is smaller than the sum of its proper divisors (129136740).

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

71742540 is a wasteful number, since it uses less digits than its factorization.

71742540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195721 (or 1195719 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 30.

The square root of 71742540 is about 8470.0968117254. The cubic root of 71742540 is about 415.5203035139.

The spelling of 71742540 in words is "seventy-one million, seven hundred forty-two thousand, five hundred forty".