78347901 has 4 divisors (see below), whose sum is σ = 104463872. Its totient is φ = 52231932.

The previous prime is 78347897. The next prime is 78347903. The reversal of 78347901 is 10974387.

78347901 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10974387 = 3 ⋅3658129.

It is not a de Polignac number, because 78347901 - 2² = 78347897 is a prime.

It is a super-2 number, since 2×78347901² = 12276787182211602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78347901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78347903) 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, 13057981 + ... + 13057986.

It is an arithmetic number, because the mean of its divisors is an integer number (26115968).

Almost surely, 2^78347901 is an apocalyptic number.

It is an amenable number.

78347901 is a deficient number, since it is larger than the sum of its proper divisors (26115971).

78347901 is a wasteful number, since it uses less digits than its factorization.

78347901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26115970.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 78347901 is about 8851.4349684105. The cubic root of 78347901 is about 427.9001663240.

It can be divided in two parts, 783 and 47901, that added together give a palindrome (48684).

The spelling of 78347901 in words is "seventy-eight million, three hundred forty-seven thousand, nine hundred one".