686478650 has 96 divisors (see below), whose sum is σ = 1523527488. Its totient is φ = 226828800.

The previous prime is 686478643. The next prime is 686478673. The reversal of 686478650 is 56874686.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 478334 + ... + 479766.

It is an arithmetic number, because the mean of its divisors is an integer number (15870078).

Almost surely, 2^686478650 is an apocalyptic number.

686478650 is an abundant number, since it is smaller than the sum of its proper divisors (837048838).

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

686478650 is a wasteful number, since it uses less digits than its factorization.

686478650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The square root of 686478650 is about 26200.7375850376. The cubic root of 686478650 is about 882.1498100981.

The spelling of 686478650 in words is "six hundred eighty-six million, four hundred seventy-eight thousand, six hundred fifty".