78587942 has 4 divisors (see below), whose sum is σ = 117881916. Its totient is φ = 39293970.

The previous prime is 78587911. The next prime is 78588001. The reversal of 78587942 is 24978587.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24978587 = 311 ⋅80317.

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, 19646984 + ... + 19646987.

It is an arithmetic number, because the mean of its divisors is an integer number (29470479).

Almost surely, 2^78587942 is an apocalyptic number.

78587942 is a deficient number, since it is larger than the sum of its proper divisors (39293974).

78587942 is a wasteful number, since it uses less digits than its factorization.

78587942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39293973.

The product of its digits is 1128960, while the sum is 50.

The square root of 78587942 is about 8864.9840383387. The cubic root of 78587942 is about 428.3367186047.

The spelling of 78587942 in words is "seventy-eight million, five hundred eighty-seven thousand, nine hundred forty-two".