72978878 has 8 divisors (see below), whose sum is σ = 125106672. Its totient is φ = 31276656.

The previous prime is 72978817. The next prime is 72978881. The reversal of 72978878 is 87887927.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2606375 + ... + 2606402.

It is an arithmetic number, because the mean of its divisors is an integer number (15638334).

Almost surely, 2^72978878 is an apocalyptic number.

72978878 is a deficient number, since it is larger than the sum of its proper divisors (52127794).

72978878 is a wasteful number, since it uses less digits than its factorization.

72978878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5212786.

The product of its digits is 3161088, while the sum is 56.

The square root of 72978878 is about 8542.7675843371. The cubic root of 72978878 is about 417.8936070729.

The spelling of 72978878 in words is "seventy-two million, nine hundred seventy-eight thousand, eight hundred seventy-eight".