72001378 has 4 divisors (see below), whose sum is σ = 108002070. Its totient is φ = 36000688.

The previous prime is 72001373. The next prime is 72001381. The reversal of 72001378 is 87310027.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54420129 + 17581249 = 7377^2 + 4193^2 .

It is not an unprimeable number, because it can be changed into a prime (72001373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18000343 + ... + 18000346.

Almost surely, 2^72001378 is an apocalyptic number.

72001378 is a deficient number, since it is larger than the sum of its proper divisors (36000692).

72001378 is a wasteful number, since it uses less digits than its factorization.

72001378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36000691.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 72001378 is about 8485.3625732788. The cubic root of 72001378 is about 416.0194186263.

The spelling of 72001378 in words is "seventy-two million, one thousand, three hundred seventy-eight".