690977784 has 64 divisors (see below), whose sum is σ = 2090361600. Its totient is φ = 185808384.

The previous prime is 690977783. The next prime is 690977821. The reversal of 690977784 is 487779096.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690977783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118114 + ... + 123825.

It is an arithmetic number, because the mean of its divisors is an integer number (32661900).

Almost surely, 2^690977784 is an apocalyptic number.

It is an amenable number.

690977784 is an abundant number, since it is smaller than the sum of its proper divisors (1399383816).

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

690977784 is a wasteful number, since it uses less digits than its factorization.

690977784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241972 (or 241968 counting only the distinct ones).

The product of its (nonzero) digits is 5334336, while the sum is 57.

The square root of 690977784 is about 26286.4562845584. The cubic root of 690977784 is about 884.0727982745.

The spelling of 690977784 in words is "six hundred ninety million, nine hundred seventy-seven thousand, seven hundred eighty-four".