64138078 has 8 divisors (see below), whose sum is σ = 96696072. Its totient is φ = 31906056.

The previous prime is 64138051. The next prime is 64138079. The reversal of 64138078 is 87083146.

It is a happy number.

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

It is a super-2 number, since 2×64138078² = 8227386099068168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64138079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81000 + ... + 81787.

It is an arithmetic number, because the mean of its divisors is an integer number (12087009).

Almost surely, 2^64138078 is an apocalyptic number.

64138078 is a deficient number, since it is larger than the sum of its proper divisors (32557994).

64138078 is a wasteful number, since it uses less digits than its factorization.

64138078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162986.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 64138078 is about 8008.6252253430. The cubic root of 64138078 is about 400.2874558733.

The spelling of 64138078 in words is "sixty-four million, one hundred thirty-eight thousand, seventy-eight".