64973040 has 80 divisors (see below), whose sum is σ = 219735936. Its totient is φ = 15750400.

The previous prime is 64973033. The next prime is 64973053. The reversal of 64973040 is 4037946.

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 (33).

It is a junction number, because it is equal to n+sod(n) for n = 64972992 and 64973010.

It is a congruent number.

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, 9666 + ... + 14945.

Almost surely, 2^64973040 is an apocalyptic number.

64973040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64973040 is an abundant number, since it is smaller than the sum of its proper divisors (154762896).

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

64973040 is a wasteful number, since it uses less digits than its factorization.

64973040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24638 (or 24632 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The square root of 64973040 is about 8060.5855866680. The cubic root of 64973040 is about 402.0169790606.

The spelling of 64973040 in words is "sixty-four million, nine hundred seventy-three thousand, forty".