64673972 has 24 divisors (see below), whose sum is σ = 123675552. Its totient is φ = 29348000.

The previous prime is 64673963. The next prime is 64673977. The reversal of 64673972 is 27937646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64673977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43847 + ... + 45297.

It is an arithmetic number, because the mean of its divisors is an integer number (5153148).

Almost surely, 2^64673972 is an apocalyptic number.

It is an amenable number.

64673972 is a deficient number, since it is larger than the sum of its proper divisors (59001580).

64673972 is a wasteful number, since it uses less digits than its factorization.

64673972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479 (or 2477 counting only the distinct ones).

The product of its digits is 381024, while the sum is 44.

The square root of 64673972 is about 8042.0129320960. The cubic root of 64673972 is about 401.3992081676.

The spelling of 64673972 in words is "sixty-four million, six hundred seventy-three thousand, nine hundred seventy-two".