1690907640 has 64 divisors (see below), whose sum is σ = 5247655200. Its totient is φ = 435359232.

The previous prime is 1690907633. The next prime is 1690907651. The reversal of 1690907640 is 467090961.

It is a junction number, because it is equal to n+sod(n) for n = 1690907592 and 1690907601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239467 + ... + 246426.

Almost surely, 2^1690907640 is an apocalyptic number.

1690907640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1690907640 is an abundant number, since it is smaller than the sum of its proper divisors (3556747560).

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

1690907640 is a wasteful number, since it uses less digits than its factorization.

1690907640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485936 (or 485932 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 1690907640 is about 41120.6473684450. The cubic root of 1690907640 is about 1191.3516266547.

The spelling of 1690907640 in words is "one billion, six hundred ninety million, nine hundred seven thousand, six hundred forty".