65678738 has 4 divisors (see below), whose sum is σ = 98518110. Its totient is φ = 32839368.

The previous prime is 65678729. The next prime is 65678749. The reversal of 65678738 is 83787656.

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 + 1630729 = 8003^2 + 1277^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16419683 + ... + 16419686.

Almost surely, 2^65678738 is an apocalyptic number.

65678738 is a deficient number, since it is larger than the sum of its proper divisors (32839372).

65678738 is a wasteful number, since it uses less digits than its factorization.

65678738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32839371.

The product of its digits is 1693440, while the sum is 50.

The square root of 65678738 is about 8104.2419756569. The cubic root of 65678738 is about 403.4672297899.

The spelling of 65678738 in words is "sixty-five million, six hundred seventy-eight thousand, seven hundred thirty-eight".