64781460 has 36 divisors (see below), whose sum is σ = 196504308. Its totient is φ = 17275008.

The previous prime is 64781449. The next prime is 64781467. The reversal of 64781460 is 6418746.

64781460 is a `hidden beast` number, since 647 + 8 + 1 + 4 + 6 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 33039504 + 31741956 = 5748^2 + 5634^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64781467) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179769 + ... + 180128.

It is an arithmetic number, because the mean of its divisors is an integer number (5458453).

Almost surely, 2^64781460 is an apocalyptic number.

64781460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64781460 is an abundant number, since it is smaller than the sum of its proper divisors (131722848).

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

64781460 is a wasteful number, since it uses less digits than its factorization.

64781460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359912 (or 359907 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 64781460 is about 8048.6930616094. The cubic root of 64781460 is about 401.6214599544.

The spelling of 64781460 in words is "sixty-four million, seven hundred eighty-one thousand, four hundred sixty".