1623978687 has 12 divisors (see below), whose sum is σ = 2263544024. Its totient is φ = 1035579600.

The previous prime is 1623978677. The next prime is 1623978689. The reversal of 1623978687 is 7868793261.

It is a de Polignac number, because none of the positive numbers 2^k-1623978687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1623978689) 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 11 ways as a sum of consecutive naturals, for example, 510064 + ... + 513237.

Almost surely, 2^1623978687 is an apocalyptic number.

1623978687 is a deficient number, since it is larger than the sum of its proper divisors (639565337).

1623978687 is a wasteful number, since it uses less digits than its factorization.

1623978687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023350 (or 1023327 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 57.

The square root of 1623978687 is about 40298.6189217447. The cubic root of 1623978687 is about 1175.4209898128.

The spelling of 1623978687 in words is "one billion, six hundred twenty-three million, nine hundred seventy-eight thousand, six hundred eighty-seven".