690688554 has 8 divisors (see below), whose sum is σ = 1381377120. Its totient is φ = 230229516.

The previous prime is 690688553. The next prime is 690688619. The reversal of 690688554 is 455886096.

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

690688554 is an admirable number.

It is a super-2 number, since 2×690688554² = 954101357253221832, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 690688497 and 690688506.

It is not an unprimeable number, because it can be changed into a prime (690688553) 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, 57557374 + ... + 57557385.

It is an arithmetic number, because the mean of its divisors is an integer number (172672140).

Almost surely, 2^690688554 is an apocalyptic number.

690688554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690688554 is a wasteful number, since it uses less digits than its factorization.

690688554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115114764.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 690688554 is about 26280.9542064210. The cubic root of 690688554 is about 883.9494291075.

The spelling of 690688554 in words is "six hundred ninety million, six hundred eighty-eight thousand, five hundred fifty-four".