64451340 has 72 divisors (see below), whose sum is σ = 202260240. Its totient is φ = 16593024.

The previous prime is 64451333. The next prime is 64451351. The reversal of 64451340 is 4315446.

64451340 is a `hidden beast` number, since 644 + 5 + 13 + 4 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 954 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (2809170).

Almost surely, 2^64451340 is an apocalyptic number.

64451340 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64451340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101130120).

64451340 is an abundant number, since it is smaller than the sum of its proper divisors (137808900).

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

64451340 is a wasteful number, since it uses less digits than its factorization.

64451340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12391 (or 12386 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 64451340 is about 8028.1591912468. The cubic root of 64451340 is about 400.9380899151.

Adding to 64451340 its reverse (4315446), we get a palindrome (68766786).

It can be divided in two parts, 644 and 51340, that added together give a square (51984 = 228²).

The spelling of 64451340 in words is "sixty-four million, four hundred fifty-one thousand, three hundred forty".