646378146 has 12 divisors (see below), whose sum is σ = 1400486022. Its totient is φ = 215459376.

The previous prime is 646378133. The next prime is 646378151. The reversal of 646378146 is 641873646.

It is a happy number.

646378146 is a `hidden beast` number, since 6 + 4 + 637 + 8 + 1 + 4 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 471107025 + 175271121 = 21705^2 + 13239^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17954931 + ... + 17954966.

Almost surely, 2^646378146 is an apocalyptic number.

646378146 is an abundant number, since it is smaller than the sum of its proper divisors (754107876).

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

646378146 is a wasteful number, since it uses less digits than its factorization.

646378146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35909905 (or 35909902 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 646378146 is about 25423.9679436551. The cubic root of 646378146 is about 864.6271889595.

The spelling of 646378146 in words is "six hundred forty-six million, three hundred seventy-eight thousand, one hundred forty-six".