22999978 has 4 divisors (see below), whose sum is σ = 34499970. Its totient is φ = 11499988.

The previous prime is 22999957. The next prime is 22999979. The reversal of 22999978 is 87999922.

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., 18173169 + 4826809 = 4263^2 + 2197^2 .

It is not an unprimeable number, because it can be changed into a prime (22999979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5749993 + ... + 5749996.

Almost surely, 2^22999978 is an apocalyptic number.

22999978 is a deficient number, since it is larger than the sum of its proper divisors (11499992).

22999978 is a wasteful number, since it uses less digits than its factorization.

22999978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11499991.

The product of its digits is 1469664, while the sum is 55.

The square root of 22999978 is about 4795.8292296536. The cubic root of 22999978 is about 284.3866073111.

It can be divided in two parts, 22 and 999978, that added together give a 6-th power (1000000 = 10⁶).

The spelling of 22999978 in words is "twenty-two million, nine hundred ninety-nine thousand, nine hundred seventy-eight".