690409782 has 24 divisors (see below), whose sum is σ = 1496487096. Its totient is φ = 230044416.

The previous prime is 690409781. The next prime is 690409787. The reversal of 690409782 is 287904096.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690409781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50353 + ... + 62579.

It is an arithmetic number, because the mean of its divisors is an integer number (62353629).

Almost surely, 2^690409782 is an apocalyptic number.

690409782 is an abundant number, since it is smaller than the sum of its proper divisors (806077314).

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

690409782 is a wasteful number, since it uses less digits than its factorization.

690409782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15372 (or 15369 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 690409782 is about 26275.6499824457. The cubic root of 690409782 is about 883.8304881322.

The spelling of 690409782 in words is "six hundred ninety million, four hundred nine thousand, seven hundred eighty-two".