216431490 has 96 divisors (see below), whose sum is σ = 577241280. Its totient is φ = 51891840.

The previous prime is 216431473. The next prime is 216431533. The reversal of 216431490 is 94134612.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 395397 + ... + 395943.

It is an arithmetic number, because the mean of its divisors is an integer number (6012930).

Almost surely, 2^216431490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216431490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288620640).

216431490 is an abundant number, since it is smaller than the sum of its proper divisors (360809790).

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

216431490 is a wasteful number, since it uses less digits than its factorization.

216431490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 216431490 is about 14711.6107207878. The cubic root of 216431490 is about 600.3992620352.

The spelling of 216431490 in words is "two hundred sixteen million, four hundred thirty-one thousand, four hundred ninety".