64400352 has 48 divisors (see below), whose sum is σ = 178999632. Its totient is φ = 20203520.

The previous prime is 64400341. The next prime is 64400383. The reversal of 64400352 is 25300446.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18099 + ... + 21362.

It is an arithmetic number, because the mean of its divisors is an integer number (3729159).

Almost surely, 2^64400352 is an apocalyptic number.

It is an amenable number.

64400352 is an abundant number, since it is smaller than the sum of its proper divisors (114599280).

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

64400352 is a wasteful number, since it uses less digits than its factorization.

64400352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39491 (or 39483 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 64400352 is about 8024.9829906362. The cubic root of 64400352 is about 400.8323335177.

Adding to 64400352 its reverse (25300446), we get a palindrome (89700798).

The spelling of 64400352 in words is "sixty-four million, four hundred thousand, three hundred fifty-two".