690917387 has 4 divisors (see below), whose sum is σ = 727281480. Its totient is φ = 654553296.

The previous prime is 690917351. The next prime is 690917393. The reversal of 690917387 is 783719096.

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 690917387 - 2¹² = 690913291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690917287) 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, 18182018 + ... + 18182055.

It is an arithmetic number, because the mean of its divisors is an integer number (181820370).

Almost surely, 2^690917387 is an apocalyptic number.

690917387 is a deficient number, since it is larger than the sum of its proper divisors (36364093).

690917387 is a wasteful number, since it uses less digits than its factorization.

690917387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36364092.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 690917387 is about 26285.3074359042. The cubic root of 690917387 is about 884.0470391730.

The spelling of 690917387 in words is "six hundred ninety million, nine hundred seventeen thousand, three hundred eighty-seven".