71751540 has 48 divisors (see below), whose sum is σ = 229606272. Its totient is φ = 16400256.

The previous prime is 71751529. The next prime is 71751541. The reversal of 71751540 is 4515717.

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 = 71751498 and 71751507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71751541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84999 + ... + 85838.

It is an arithmetic number, because the mean of its divisors is an integer number (4783464).

Almost surely, 2^71751540 is an apocalyptic number.

71751540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71751540 is an abundant number, since it is smaller than the sum of its proper divisors (157854732).

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

71751540 is a wasteful number, since it uses less digits than its factorization.

71751540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170856 (or 170854 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 30.

The square root of 71751540 is about 8470.6280758867. The cubic root of 71751540 is about 415.5376782652.

The spelling of 71751540 in words is "seventy-one million, seven hundred fifty-one thousand, five hundred forty".