78001791 has 16 divisors (see below), whose sum is σ = 119249664. Its totient is φ = 44426304.

The previous prime is 78001787. The next prime is 78001837. The reversal of 78001791 is 19710087.

It is not a de Polignac number, because 78001791 - 2² = 78001787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78001711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 640 + ... + 12506.

It is an arithmetic number, because the mean of its divisors is an integer number (7453104).

Almost surely, 2^78001791 is an apocalyptic number.

78001791 is a deficient number, since it is larger than the sum of its proper divisors (41247873).

78001791 is a wasteful number, since it uses less digits than its factorization.

78001791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12190.

The product of its (nonzero) digits is 3528, while the sum is 33.

The square root of 78001791 is about 8831.8622611542. The cubic root of 78001791 is about 427.2691383720.

It can be divided in two parts, 7800 and 1791, that added together give a triangular number (9591 = T₁₃₈).

The spelling of 78001791 in words is "seventy-eight million, one thousand, seven hundred ninety-one".