87643478 has 32 divisors (see below), whose sum is σ = 149155776. Its totient is φ = 38320128.

The previous prime is 87643471. The next prime is 87643511. The reversal of 87643478 is 87434678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87643471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66926 + ... + 68222.

It is an arithmetic number, because the mean of its divisors is an integer number (4661118).

Almost surely, 2^87643478 is an apocalyptic number.

87643478 is a deficient number, since it is larger than the sum of its proper divisors (61512298).

87643478 is a wasteful number, since it uses less digits than its factorization.

87643478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448.

The product of its digits is 903168, while the sum is 47.

The square root of 87643478 is about 9361.8095473044. The cubic root of 87643478 is about 444.1945249132.

The spelling of 87643478 in words is "eighty-seven million, six hundred forty-three thousand, four hundred seventy-eight".