64948778 has 4 divisors (see below), whose sum is σ = 97423170. Its totient is φ = 32474388.

The previous prime is 64948769. The next prime is 64948781. The reversal of 64948778 is 87784946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87784946 = 2 ⋅43892473.

It can be written as a sum of positive squares in only one way, i.e., 64850809 + 97969 = 8053^2 + 313^2 .

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, 16237193 + ... + 16237196.

Almost surely, 2^64948778 is an apocalyptic number.

64948778 is a deficient number, since it is larger than the sum of its proper divisors (32474392).

64948778 is a wasteful number, since it uses less digits than its factorization.

64948778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32474391.

The product of its digits is 2709504, while the sum is 53.

The square root of 64948778 is about 8059.0804686391. The cubic root of 64948778 is about 401.9669329170.

The spelling of 64948778 in words is "sixty-four million, nine hundred forty-eight thousand, seven hundred seventy-eight".