72061778 has 8 divisors (see below), whose sum is σ = 108149580. Its totient is φ = 36011920.

The previous prime is 72061757. The next prime is 72061819. The reversal of 72061778 is 87716027.

It can be written as a sum of positive squares in 2 ways, for example, as 71961289 + 100489 = 8483^2 + 317^2 .

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

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, 4133 + ... + 12696.

Almost surely, 2^72061778 is an apocalyptic number.

72061778 is a deficient number, since it is larger than the sum of its proper divisors (36087802).

72061778 is a wasteful number, since it uses less digits than its factorization.

72061778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18972.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 72061778 is about 8488.9208972637. The cubic root of 72061778 is about 416.1357152426.

The spelling of 72061778 in words is "seventy-two million, sixty-one thousand, seven hundred seventy-eight".