694996640 has 48 divisors (see below), whose sum is σ = 1768237128. Its totient is φ = 256613376.

The previous prime is 694996583. The next prime is 694996693. The reversal of 694996640 is 46699496.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 642521104 + 52475536 = 25348^2 + 7244^2 .

It is a super-2 number, since 2×694996640² = 966040659222579200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164987 + ... + 169146.

Almost surely, 2^694996640 is an apocalyptic number.

It is an amenable number.

694996640 is an abundant number, since it is smaller than the sum of its proper divisors (1073240488).

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

694996640 is a wasteful number, since it uses less digits than its factorization.

694996640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334161 (or 334153 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 53.

The square root of 694996640 is about 26362.7889268188. The cubic root of 694996640 is about 885.7834636023.

The spelling of 694996640 in words is "six hundred ninety-four million, nine hundred ninety-six thousand, six hundred forty".