78001582 has 4 divisors (see below), whose sum is σ = 117002376. Its totient is φ = 39000790.

The previous prime is 78001543. The next prime is 78001597. The reversal of 78001582 is 28510087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28510087 = 23 ⋅1239569.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19500394 + ... + 19500397.

It is an arithmetic number, because the mean of its divisors is an integer number (29250594).

Almost surely, 2^78001582 is an apocalyptic number.

78001582 is a deficient number, since it is larger than the sum of its proper divisors (39000794).

78001582 is a wasteful number, since it uses less digits than its factorization.

78001582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39000793.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 78001582 is about 8831.8504289871. The cubic root of 78001582 is about 427.2687567597.

The spelling of 78001582 in words is "seventy-eight million, one thousand, five hundred eighty-two".