690977 has 4 divisors (see below), whose sum is σ = 789696. Its totient is φ = 592260.

The previous prime is 690953. The next prime is 690997. The reversal of 690977 is 779096.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 690977 - 2⁸ = 690721 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 690977.

It is not an unprimeable number, because it can be changed into a prime (690997) 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, 49349 + ... + 49362.

It is an arithmetic number, because the mean of its divisors is an integer number (197424).

2⁶⁹⁰⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

690977 is a deficient number, since it is larger than the sum of its proper divisors (98719).

690977 is an equidigital number, since it uses as much as digits as its factorization.

690977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98718.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 690977 is about 831.2502631579. The cubic root of 690977 is about 88.4072463911.

The spelling of 690977 in words is "six hundred ninety thousand, nine hundred seventy-seven".