19436723640 has 48 divisors (see below), whose sum is σ = 63169353000. Its totient is φ = 5183126208.

The previous prime is 19436723629. The next prime is 19436723659. The reversal of 19436723640 is 4632763491.

19436723640 is a `hidden beast` number, since 19 + 4 + 367 + 236 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26995090 + ... + 26995809.

Almost surely, 2^19436723640 is an apocalyptic number.

19436723640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19436723640 is an abundant number, since it is smaller than the sum of its proper divisors (43732629360).

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

19436723640 is a wasteful number, since it uses less digits than its factorization.

19436723640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53990916 (or 53990909 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 19436723640 in words is "nineteen billion, four hundred thirty-six million, seven hundred twenty-three thousand, six hundred forty".