72678658 has 16 divisors (see below), whose sum is σ = 117605880. Its totient is φ = 33486336.

The previous prime is 72678649. The next prime is 72678659. The reversal of 72678658 is 85687627.

It can be written as a sum of positive squares in 4 ways, for example, as 69605649 + 3073009 = 8343^2 + 1753^2 .

It is not an unprimeable number, because it can be changed into a prime (72678659) 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, 15538 + ... + 19666.

Almost surely, 2^72678658 is an apocalyptic number.

72678658 is a deficient number, since it is larger than the sum of its proper divisors (44927222).

72678658 is a wasteful number, since it uses less digits than its factorization.

72678658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4821.

The product of its digits is 1128960, while the sum is 49.

The square root of 72678658 is about 8525.1778867071. The cubic root of 72678658 is about 417.3197768758.

The spelling of 72678658 in words is "seventy-two million, six hundred seventy-eight thousand, six hundred fifty-eight".