947561636 has 36 divisors (see below), whose sum is σ = 1979151552. Its totient is φ = 388121184.

The previous prime is 947561633. The next prime is 947561663. The reversal of 947561636 is 636165749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (947561633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 780566 + ... + 781778.

It is an arithmetic number, because the mean of its divisors is an integer number (54976432).

Almost surely, 2^947561636 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 947561636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989575776).

947561636 is an abundant number, since it is smaller than the sum of its proper divisors (1031589916).

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

947561636 is a wasteful number, since it uses less digits than its factorization.

947561636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460 (or 1245 counting only the distinct ones).

The product of its digits is 816480, while the sum is 47.

The square root of 947561636 is about 30782.4891131305. The cubic root of 947561636 is about 982.2057894892.

The spelling of 947561636 in words is "nine hundred forty-seven million, five hundred sixty-one thousand, six hundred thirty-six".