22729978 has 4 divisors (see below), whose sum is σ = 34094970. Its totient is φ = 11364988.

The previous prime is 22729963. The next prime is 22729981. The reversal of 22729978 is 87992722.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21224449 + 1505529 = 4607^2 + 1227^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5682493 + ... + 5682496.

Almost surely, 2^22729978 is an apocalyptic number.

22729978 is a deficient number, since it is larger than the sum of its proper divisors (11364992).

22729978 is a wasteful number, since it uses less digits than its factorization.

22729978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11364991.

The product of its digits is 254016, while the sum is 46.

The square root of 22729978 is about 4767.5966691825. The cubic root of 22729978 is about 283.2694059542.

The spelling of 22729978 in words is "twenty-two million, seven hundred twenty-nine thousand, nine hundred seventy-eight".