64819774 has 4 divisors (see below), whose sum is σ = 97229664. Its totient is φ = 32409886.

The previous prime is 64819771. The next prime is 64819787. The reversal of 64819774 is 47791846.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×64819774² = 8403206202822152, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64819771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16204942 + ... + 16204945.

It is an arithmetic number, because the mean of its divisors is an integer number (24307416).

Almost surely, 2^64819774 is an apocalyptic number.

64819774 is a deficient number, since it is larger than the sum of its proper divisors (32409890).

64819774 is a wasteful number, since it uses less digits than its factorization.

64819774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32409889.

The product of its digits is 338688, while the sum is 46.

The square root of 64819774 is about 8051.0728477638. The cubic root of 64819774 is about 401.7006219657.

The spelling of 64819774 in words is "sixty-four million, eight hundred nineteen thousand, seven hundred seventy-four".