32447278640 has 320 divisors, whose sum is σ = 91194163200. Its totient is φ = 10725120000.

The previous prime is 32447278639. The next prime is 32447278693. The reversal of 32447278640 is 4687274423.

It is a happy number.

It is a super-2 number, since 2×32447278640² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169880945 + ... + 169881135.

It is an arithmetic number, because the mean of its divisors is an integer number (284981760).

Almost surely, 2^32447278640 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 32447278640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45597081600).

32447278640 is an abundant number, since it is smaller than the sum of its proper divisors (58746884560).

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

32447278640 is a wasteful number, since it uses less digits than its factorization.

32447278640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 47.

The spelling of 32447278640 in words is "thirty-two billion, four hundred forty-seven million, two hundred seventy-eight thousand, six hundred forty".