406688780 has 12 divisors (see below), whose sum is σ = 854046480. Its totient is φ = 162675504.

The previous prime is 406688743. The next prime is 406688801. The reversal of 406688780 is 87886604.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10167200 + ... + 10167239.

It is an arithmetic number, because the mean of its divisors is an integer number (71170540).

Almost surely, 2^406688780 is an apocalyptic number.

It is an amenable number.

406688780 is an abundant number, since it is smaller than the sum of its proper divisors (447357700).

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

406688780 is a wasteful number, since it uses less digits than its factorization.

406688780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20334448 (or 20334446 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The square root of 406688780 is about 20166.5262254063. The cubic root of 406688780 is about 740.8905640383.

The spelling of 406688780 in words is "four hundred six million, six hundred eighty-eight thousand, seven hundred eighty".