690427997 has 8 divisors (see below), whose sum is σ = 790671552. Its totient is φ = 590587200.

The previous prime is 690427993. The next prime is 690428003. The reversal of 690427997 is 799724096.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 690427997 - 2² = 690427993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690427993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97004 + ... + 103877.

It is an arithmetic number, because the mean of its divisors is an integer number (98833944).

Almost surely, 2^690427997 is an apocalyptic number.

It is an amenable number.

690427997 is a deficient number, since it is larger than the sum of its proper divisors (100243555).

690427997 is a wasteful number, since it uses less digits than its factorization.

690427997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201379.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The square root of 690427997 is about 26275.9965938497. The cubic root of 690427997 is about 883.8382607291.

The spelling of 690427997 in words is "six hundred ninety million, four hundred twenty-seven thousand, nine hundred ninety-seven".