72870401 has 4 divisors (see below), whose sum is σ = 72888900. Its totient is φ = 72851904.

The previous prime is 72870397. The next prime is 72870403. The reversal of 72870401 is 10407827.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50069776 + 22800625 = 7076^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 72870401 - 2² = 72870397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72870403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 716 + ... + 12093.

It is an arithmetic number, because the mean of its divisors is an integer number (18222225).

Almost surely, 2^72870401 is an apocalyptic number.

It is an amenable number.

72870401 is a deficient number, since it is larger than the sum of its proper divisors (18499).

72870401 is a wasteful number, since it uses less digits than its factorization.

72870401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18498.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 72870401 is about 8536.4161683929. The cubic root of 72870401 is about 417.6864497634.

The spelling of 72870401 in words is "seventy-two million, eight hundred seventy thousand, four hundred one".