690412554 has 48 divisors (see below), whose sum is σ = 1619962344. Its totient is φ = 211248000.

The previous prime is 690412549. The next prime is 690412559. The reversal of 690412554 is 455214096.

690412554 is a `hidden beast` number, since 6 + 90 + 4 + 12 + 554 = 666.

It is an interprime number because it is at equal distance from previous prime (690412549) and next prime (690412559).

It can be written as a sum of positive squares in 4 ways, for example, as 376166025 + 314246529 = 19395^2 + 17727^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (690412559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34204 + ... + 50504.

Almost surely, 2^690412554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690412554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809981172).

690412554 is an abundant number, since it is smaller than the sum of its proper divisors (929549790).

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

690412554 is a wasteful number, since it uses less digits than its factorization.

690412554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16503 (or 16500 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 690412554 is about 26275.7027308500. The cubic root of 690412554 is about 883.8316709925.

The spelling of 690412554 in words is "six hundred ninety million, four hundred twelve thousand, five hundred fifty-four".