64289780 has 12 divisors (see below), whose sum is σ = 135008580. Its totient is φ = 25715904.

The previous prime is 64289759. The next prime is 64289803. The reversal of 64289780 is 8798246.

It can be written as a sum of positive squares in 2 ways, for example, as 28601104 + 35688676 = 5348^2 + 5974^2 .

It is a congruent number.

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, 1607225 + ... + 1607264.

It is an arithmetic number, because the mean of its divisors is an integer number (11250715).

Almost surely, 2^64289780 is an apocalyptic number.

It is an amenable number.

64289780 is an abundant number, since it is smaller than the sum of its proper divisors (70718800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64289780 is a wasteful number, since it uses less digits than its factorization.

64289780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214498 (or 3214496 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 64289780 is about 8018.0907951956. The cubic root of 64289780 is about 400.6027994590.

The spelling of 64289780 in words is "sixty-four million, two hundred eighty-nine thousand, seven hundred eighty".