213087534 has 72 divisors (see below), whose sum is σ = 486540600. Its totient is φ = 62166720.

The previous prime is 213087529. The next prime is 213087547. The reversal of 213087534 is 435780312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 213087495 and 213087504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 610392 + ... + 610740.

Almost surely, 2^213087534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213087534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243270300).

213087534 is an abundant number, since it is smaller than the sum of its proper divisors (273453066).

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

213087534 is a wasteful number, since it uses less digits than its factorization.

213087534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 394 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 213087534 is about 14597.5180767143. The cubic root of 213087534 is about 597.2910600360.

The spelling of 213087534 in words is "two hundred thirteen million, eighty-seven thousand, five hundred thirty-four".