690072539 has 4 divisors (see below), whose sum is σ = 743155056. Its totient is φ = 636990024.

The previous prime is 690072529. The next prime is 690072623. The reversal of 690072539 is 935270096.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690072539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690072496 and 690072505.

It is not an unprimeable number, because it can be changed into a prime (690072529) 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, 26541239 + ... + 26541264.

It is an arithmetic number, because the mean of its divisors is an integer number (185788764).

Almost surely, 2^690072539 is an apocalyptic number.

690072539 is a deficient number, since it is larger than the sum of its proper divisors (53082517).

690072539 is a wasteful number, since it uses less digits than its factorization.

690072539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53082516.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 690072539 is about 26269.2317931073. The cubic root of 690072539 is about 883.6865570939.

The spelling of 690072539 in words is "six hundred ninety million, seventy-two thousand, five hundred thirty-nine".