1691740224 has 42 divisors (see below), whose sum is σ = 4849069550. Its totient is φ = 563913216.

The previous prime is 1691740223. The next prime is 1691740241. The reversal of 1691740224 is 4220471961.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1003622400 + 688117824 = 31680^2 + 26232^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1691740223) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1467949 + ... + 1469100.

Almost surely, 2^1691740224 is an apocalyptic number.

It is an amenable number.

1691740224 is an abundant number, since it is smaller than the sum of its proper divisors (3157329326).

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

1691740224 is a wasteful number, since it uses less digits than its factorization.

1691740224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2937067 (or 2937054 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 1691740224 is about 41130.7697958596. The cubic root of 1691740224 is about 1191.5471306399.

The spelling of 1691740224 in words is "one billion, six hundred ninety-one million, seven hundred forty thousand, two hundred twenty-four".