72678649 has 2 divisors, whose sum is σ = 72678650. Its totient is φ = 72678648.

The previous prime is 72678631. The next prime is 72678659. The reversal of 72678649 is 94687627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72131049 + 547600 = 8493^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 72678649 - 2⁷ = 72678521 is a prime.

It is not a weakly prime, because it can be changed into another prime (72678659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36339324 + 36339325.

It is an arithmetic number, because the mean of its divisors is an integer number (36339325).

Almost surely, 2^72678649 is an apocalyptic number.

It is an amenable number.

72678649 is a deficient number, since it is larger than the sum of its proper divisors (1).

72678649 is an equidigital number, since it uses as much as digits as its factorization.

72678649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 72678649 is about 8525.1773588589. The cubic root of 72678649 is about 417.3197596499.

The spelling of 72678649 in words is "seventy-two million, six hundred seventy-eight thousand, six hundred forty-nine".