64207920 has 80 divisors (see below), whose sum is σ = 227485440. Its totient is φ = 14675712.

The previous prime is 64207907. The next prime is 64207937. The reversal of 64207920 is 2970246.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17430 + ... + 20789.

It is an arithmetic number, because the mean of its divisors is an integer number (2843568).

Almost surely, 2^64207920 is an apocalyptic number.

64207920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64207920 is an abundant number, since it is smaller than the sum of its proper divisors (163277520).

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

64207920 is a wasteful number, since it uses less digits than its factorization.

64207920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38242 (or 38236 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 64207920 is about 8012.9844627330. The cubic root of 64207920 is about 400.4326984281.

The spelling of 64207920 in words is "sixty-four million, two hundred seven thousand, nine hundred twenty".