64815442 has 8 divisors (see below), whose sum is σ = 97306956. Its totient is φ = 32379792.

The previous prime is 64815431. The next prime is 64815461. The reversal of 64815442 is 24451846.

It can be written as a sum of positive squares in 2 ways, for example, as 52432081 + 12383361 = 7241^2 + 3519^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 64815398 and 64815407.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10933 + ... + 15784.

Almost surely, 2^64815442 is an apocalyptic number.

64815442 is a deficient number, since it is larger than the sum of its proper divisors (32491514).

64815442 is a wasteful number, since it uses less digits than its factorization.

64815442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27932.

The product of its digits is 30720, while the sum is 34.

The square root of 64815442 is about 8050.8038108005. The cubic root of 64815442 is about 401.6916730202.

The spelling of 64815442 in words is "sixty-four million, eight hundred fifteen thousand, four hundred forty-two".