72947684 has 6 divisors (see below), whose sum is σ = 127658454. Its totient is φ = 36473840.

The previous prime is 72947671. The next prime is 72947687. The reversal of 72947684 is 48674927.

It can be written as a sum of positive squares in only one way, i.e., 72726784 + 220900 = 8528^2 + 470^2 .

It is not an unprimeable number, because it can be changed into a prime (72947687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9118457 + ... + 9118464.

It is an arithmetic number, because the mean of its divisors is an integer number (21276409).

Almost surely, 2^72947684 is an apocalyptic number.

It is an amenable number.

72947684 is a deficient number, since it is larger than the sum of its proper divisors (54710770).

72947684 is a wasteful number, since it uses less digits than its factorization.

72947684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18236925 (or 18236923 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 72947684 is about 8540.9416342696. The cubic root of 72947684 is about 417.8340572812.

The spelling of 72947684 in words is "seventy-two million, nine hundred forty-seven thousand, six hundred eighty-four".