87478922 has 4 divisors (see below), whose sum is σ = 131218386. Its totient is φ = 43739460.

The previous prime is 87478921. The next prime is 87478933. The reversal of 87478922 is 22987478.

It is a happy number.

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., 61763881 + 25715041 = 7859^2 + 5071^2 .

It is not an unprimeable number, because it can be changed into a prime (87478921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21869729 + ... + 21869732.

Almost surely, 2^87478922 is an apocalyptic number.

87478922 is a deficient number, since it is larger than the sum of its proper divisors (43739464).

87478922 is a wasteful number, since it uses less digits than its factorization.

87478922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43739463.

The product of its digits is 451584, while the sum is 47.

The square root of 87478922 is about 9353.0167325842. The cubic root of 87478922 is about 443.9163499312.

The spelling of 87478922 in words is "eighty-seven million, four hundred seventy-eight thousand, nine hundred twenty-two".