681523236 has 81 divisors (see below), whose sum is σ = 1826156241. Its totient is φ = 214278048.

The previous prime is 681523201. The next prime is 681523247. The reversal of 681523236 is 632325186.

681523236 = 1³ + 2³ + ... + 228³.

It is a happy number.

The square root of 681523236 is 26106.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 634737636 + 46785600 = 25194^2 + 6840^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 681523236.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2975970 + ... + 2976198.

Almost surely, 2^681523236 is an apocalyptic number.

681523236 is the 26106-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681523236

681523236 is an abundant number, since it is smaller than the sum of its proper divisors (1144633005).

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

681523236 is a wasteful number, since it uses less digits than its factorization.

681523236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 253 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The cubic root of 681523236 is about 880.0220535107.

Multiplying 681523236 by its sum of digits (36), we get a square (24534836496 = 156636²).

681523236 divided by its sum of digits (36) gives a square (18931201 = 4351²).

The spelling of 681523236 in words is "six hundred eighty-one million, five hundred twenty-three thousand, two hundred thirty-six".