71784130 has 32 divisors (see below), whose sum is σ = 142274880. Its totient is φ = 25859520.

The previous prime is 71784113. The next prime is 71784131. The reversal of 71784130 is 3148717.

It is a super-2 number, since 2×71784130² = 10305922639713800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71784092 and 71784101.

It is not an unprimeable number, because it can be changed into a prime (71784131) 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, 8997 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (4446090).

Almost surely, 2^71784130 is an apocalyptic number.

71784130 is a deficient number, since it is larger than the sum of its proper divisors (70490750).

71784130 is a wasteful number, since it uses less digits than its factorization.

71784130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6114.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 71784130 is about 8472.5515637262. The cubic root of 71784130 is about 415.6005820166.

The spelling of 71784130 in words is "seventy-one million, seven hundred eighty-four thousand, one hundred thirty".