64487578 has 4 divisors (see below), whose sum is σ = 96731370. Its totient is φ = 32243788.

The previous prime is 64487537. The next prime is 64487581. The reversal of 64487578 is 87578446.

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., 64048009 + 439569 = 8003^2 + 663^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16121893 + ... + 16121896.

Almost surely, 2^64487578 is an apocalyptic number.

64487578 is a deficient number, since it is larger than the sum of its proper divisors (32243792).

64487578 is a wasteful number, since it uses less digits than its factorization.

64487578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32243791.

The product of its digits is 1505280, while the sum is 49.

The square root of 64487578 is about 8030.4158049257. The cubic root of 64487578 is about 401.0132188021.

The spelling of 64487578 in words is "sixty-four million, four hundred eighty-seven thousand, five hundred seventy-eight".