22087972 has 6 divisors (see below), whose sum is σ = 38653958. Its totient is φ = 11043984.

The previous prime is 22087969. The next prime is 22087999. The reversal of 22087972 is 27978022.

It can be written as a sum of positive squares in only one way, i.e., 19855936 + 2232036 = 4456^2 + 1494^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2760993 + ... + 2761000.

Almost surely, 2^22087972 is an apocalyptic number.

It is an amenable number.

22087972 is a deficient number, since it is larger than the sum of its proper divisors (16565986).

22087972 is a wasteful number, since it uses less digits than its factorization.

22087972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5521997 (or 5521995 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 22087972 is about 4699.7842503672. The cubic root of 22087972 is about 280.5769227148.

The spelling of 22087972 in words is "twenty-two million, eighty-seven thousand, nine hundred seventy-two".