64471890 has 32 divisors (see below), whose sum is σ = 176837760. Its totient is φ = 14736384.

The previous prime is 64471877. The next prime is 64471907. The reversal of 64471890 is 9817446.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153295 + ... + 153714.

It is an arithmetic number, because the mean of its divisors is an integer number (5526180).

Almost surely, 2^64471890 is an apocalyptic number.

64471890 is an abundant number, since it is smaller than the sum of its proper divisors (112365870).

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

64471890 is a wasteful number, since it uses less digits than its factorization.

64471890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307026.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 64471890 is about 8029.4389592300. The cubic root of 64471890 is about 400.9806977813.

The spelling of 64471890 in words is "sixty-four million, four hundred seventy-one thousand, eight hundred ninety".