71840478 has 16 divisors (see below), whose sum is σ = 143994240. Its totient is φ = 23894616.

The previous prime is 71840473. The next prime is 71840497. The reversal of 71840478 is 87404817.

It is a super-2 number, since 2×71840478² = 10322108558536968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71840473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10018 + ... + 15621.

It is an arithmetic number, because the mean of its divisors is an integer number (8999640).

Almost surely, 2^71840478 is an apocalyptic number.

71840478 is an abundant number, since it is smaller than the sum of its proper divisors (72153762).

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

71840478 is a wasteful number, since it uses less digits than its factorization.

71840478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26111.

The product of its (nonzero) digits is 50176, while the sum is 39.

The square root of 71840478 is about 8475.8762378883. The cubic root of 71840478 is about 415.7092974888.

The spelling of 71840478 in words is "seventy-one million, eight hundred forty thousand, four hundred seventy-eight".