216457704 has 64 divisors (see below), whose sum is σ = 610286400. Its totient is φ = 71070912.

The previous prime is 216457691. The next prime is 216457729. The reversal of 216457704 is 407754612.

216457704 is a `hidden beast` number, since 2 + 1 + 645 + 7 + 7 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 6994 + ... + 21950.

It is an arithmetic number, because the mean of its divisors is an integer number (9535725).

Almost surely, 2^216457704 is an apocalyptic number.

216457704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216457704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305143200).

216457704 is an abundant number, since it is smaller than the sum of its proper divisors (393828696).

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

216457704 is a wasteful number, since it uses less digits than its factorization.

216457704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15039 (or 15029 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 216457704 is about 14712.5016227697. The cubic root of 216457704 is about 600.4235010078.

The spelling of 216457704 in words is "two hundred sixteen million, four hundred fifty-seven thousand, seven hundred four".