78473437691 has 8 divisors (see below), whose sum is σ = 86569268400. Its totient is φ = 70537920640.

The previous prime is 78473437667. The next prime is 78473437703. The reversal of 78473437691 is 19673437487.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-78473437691 is a prime.

It is a super-2 number, since 2×78473437691² (a number of 23 digits) 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 78473437691.

It is not an unprimeable number, because it can be changed into a prime (78473437391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40077386 + ... + 40079343.

It is an arithmetic number, because the mean of its divisors is an integer number (10821158550).

Almost surely, 2^78473437691 is an apocalyptic number.

78473437691 is a deficient number, since it is larger than the sum of its proper divisors (8095830709).

78473437691 is a wasteful number, since it uses less digits than its factorization.

78473437691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80156829.

The product of its digits is 21337344, while the sum is 59.

The spelling of 78473437691 in words is "seventy-eight billion, four hundred seventy-three million, four hundred thirty-seven thousand, six hundred ninety-one".