78413591 has 4 divisors (see below), whose sum is σ = 79174992. Its totient is φ = 77652192.

The previous prime is 78413581. The next prime is 78413611. The reversal of 78413591 is 19531487.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78413591 is a prime.

It is a super-2 number, since 2×78413591² = 12297382507030562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78413581) 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, 380546 + ... + 380751.

It is an arithmetic number, because the mean of its divisors is an integer number (19793748).

Almost surely, 2^78413591 is an apocalyptic number.

78413591 is a deficient number, since it is larger than the sum of its proper divisors (761401).

78413591 is a wasteful number, since it uses less digits than its factorization.

78413591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761400.

The product of its digits is 30240, while the sum is 38.

The square root of 78413591 is about 8855.1448887074. The cubic root of 78413591 is about 428.0197224295.

The spelling of 78413591 in words is "seventy-eight million, four hundred thirteen thousand, five hundred ninety-one".