19761987092 has 6 divisors (see below), whose sum is σ = 34583477418. Its totient is φ = 9880993544.

The previous prime is 19761987031. The next prime is 19761987149. The reversal of 19761987092 is 29078916791.

It can be written as a sum of positive squares in only one way, i.e., 18783798916 + 978188176 = 137054^2 + 31276^2 .

It is a super-2 number, since 2×19761987092² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2470248383 + ... + 2470248390.

It is an arithmetic number, because the mean of its divisors is an integer number (5763912903).

Almost surely, 2^19761987092 is an apocalyptic number.

It is an amenable number.

19761987092 is a deficient number, since it is larger than the sum of its proper divisors (14821490326).

19761987092 is a wasteful number, since it uses less digits than its factorization.

19761987092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940496777 (or 4940496775 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 59.

The spelling of 19761987092 in words is "nineteen billion, seven hundred sixty-one million, nine hundred eighty-seven thousand, ninety-two".