690023293 has 4 divisors (see below), whose sum is σ = 690080380. Its totient is φ = 689966208.

The previous prime is 690023287. The next prime is 690023333. The reversal of 690023293 is 392320096.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 326091364 + 363931929 = 18058^2 + 19077^2 .

It is a cyclic number.

It is not a de Polignac number, because 690023293 - 2²⁹ = 153152381 is a prime.

It is a super-2 number, since 2×690023293² = 952264289765127698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690023263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2478 + ... + 37231.

It is an arithmetic number, because the mean of its divisors is an integer number (172520095).

Almost surely, 2^690023293 is an apocalyptic number.

It is an amenable number.

690023293 is a deficient number, since it is larger than the sum of its proper divisors (57087).

690023293 is a wasteful number, since it uses less digits than its factorization.

690023293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57086.

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 690023293 is about 26268.2944440632. The cubic root of 690023293 is about 883.6655356018.

The spelling of 690023293 in words is "six hundred ninety million, twenty-three thousand, two hundred ninety-three".