78437201 has 6 divisors (see below), whose sum is σ = 83322870. Its totient is φ = 73822976.

The previous prime is 78437189. The next prime is 78437209. The reversal of 78437201 is 10273487.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 42915601 + 35521600 = 6551^2 + 5960^2 .

It is not a de Polignac number, because 78437201 - 2¹⁴ = 78420817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78437209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 135416 + ... + 135993.

It is an arithmetic number, because the mean of its divisors is an integer number (13887145).

Almost surely, 2^78437201 is an apocalyptic number.

It is an amenable number.

78437201 is a deficient number, since it is larger than the sum of its proper divisors (4885669).

78437201 is a wasteful number, since it uses less digits than its factorization.

78437201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271443 (or 271426 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 78437201 is about 8856.4779116757. The cubic root of 78437201 is about 428.0626764269.

The spelling of 78437201 in words is "seventy-eight million, four hundred thirty-seven thousand, two hundred one".