690987906 has 48 divisors (see below), whose sum is σ = 1745952000. Its totient is φ = 197423352.

The previous prime is 690987893. The next prime is 690987907. The reversal of 690987906 is 609789096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690987907) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49786 + ... + 62133.

It is an arithmetic number, because the mean of its divisors is an integer number (36374000).

Almost surely, 2^690987906 is an apocalyptic number.

690987906 is an abundant number, since it is smaller than the sum of its proper divisors (1054964094).

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

690987906 is a wasteful number, since it uses less digits than its factorization.

690987906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111948 (or 111931 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 690987906 is about 26286.6488164619. The cubic root of 690987906 is about 884.0771151239.

The spelling of 690987906 in words is "six hundred ninety million, nine hundred eighty-seven thousand, nine hundred six".