71647420 has 48 divisors (see below), whose sum is σ = 162852480. Its totient is φ = 26320896.

The previous prime is 71647409. The next prime is 71647439. The reversal of 71647420 is 2474617.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61564 + ... + 62716.

It is an arithmetic number, because the mean of its divisors is an integer number (3392760).

Almost surely, 2^71647420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71647420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81426240).

71647420 is an abundant number, since it is smaller than the sum of its proper divisors (91205060).

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

71647420 is a wasteful number, since it uses less digits than its factorization.

71647420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1412 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 71647420 is about 8464.4799013288. The cubic root of 71647420 is about 415.3365828003.

The spelling of 71647420 in words is "seventy-one million, six hundred forty-seven thousand, four hundred twenty".