690716641 has 4 divisors (see below), whose sum is σ = 690859972. Its totient is φ = 690573312.

The previous prime is 690716639. The next prime is 690716651. The reversal of 690716641 is 146617096.

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 170694225 + 520022416 = 13065^2 + 22804^2 .

It is a cyclic number.

It is not a de Polignac number, because 690716641 - 2¹ = 690716639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690716594 and 690716603.

It is not an unprimeable number, because it can be changed into a prime (690716651) 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, 64176 + ... + 74161.

It is an arithmetic number, because the mean of its divisors is an integer number (172714993).

Almost surely, 2^690716641 is an apocalyptic number.

It is an amenable number.

690716641 is a deficient number, since it is larger than the sum of its proper divisors (143331).

690716641 is a wasteful number, since it uses less digits than its factorization.

690716641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143330.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 690716641 is about 26281.4885613429. The cubic root of 690716641 is about 883.9614109436.

The spelling of 690716641 in words is "six hundred ninety million, seven hundred sixteen thousand, six hundred forty-one".