690591995 has 4 divisors (see below), whose sum is σ = 828710400. Its totient is φ = 552473592.

The previous prime is 690591947. The next prime is 690592027. The reversal of 690591995 is 599195096.

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

It is a cyclic number.

It is not a de Polignac number, because 690591995 - 2⁶ = 690591931 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69059195 + ... + 69059204.

It is an arithmetic number, because the mean of its divisors is an integer number (207177600).

Almost surely, 2^690591995 is an apocalyptic number.

690591995 is a deficient number, since it is larger than the sum of its proper divisors (138118405).

690591995 is a wasteful number, since it uses less digits than its factorization.

690591995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138118404.

The product of its (nonzero) digits is 984150, while the sum is 53.

The square root of 690591995 is about 26279.1170894305. The cubic root of 690591995 is about 883.9082348286.

The spelling of 690591995 in words is "six hundred ninety million, five hundred ninety-one thousand, nine hundred ninety-five".