690749837 has 4 divisors (see below), whose sum is σ = 707597436. Its totient is φ = 673902240.

The previous prime is 690749803. The next prime is 690749867. The reversal of 690749837 is 738947096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 110229001 + 580520836 = 10499^2 + 24094^2 .

It is not a de Polignac number, because 690749837 - 2⁸ = 690749581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690749867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8423738 + ... + 8423819.

It is an arithmetic number, because the mean of its divisors is an integer number (176899359).

Almost surely, 2^690749837 is an apocalyptic number.

It is an amenable number.

690749837 is a deficient number, since it is larger than the sum of its proper divisors (16847599).

690749837 is a wasteful number, since it uses less digits than its factorization.

690749837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16847598.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 690749837 is about 26282.1201009355. The cubic root of 690749837 is about 883.9755718460.

The spelling of 690749837 in words is "six hundred ninety million, seven hundred forty-nine thousand, eight hundred thirty-seven".