78542736 has 40 divisors (see below), whose sum is σ = 203424480. Its totient is φ = 26113536.

The previous prime is 78542729. The next prime is 78542777. The reversal of 78542736 is 63724587.

It is a super-2 number, since 2×78542736² = 12337922756731392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18895 + ... + 22673.

It is an arithmetic number, because the mean of its divisors is an integer number (5085612).

Almost surely, 2^78542736 is an apocalyptic number.

It is an amenable number.

78542736 is an abundant number, since it is smaller than the sum of its proper divisors (124881744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78542736 is a wasteful number, since it uses less digits than its factorization.

78542736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4223 (or 4217 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 78542736 is about 8862.4339771871. The cubic root of 78542736 is about 428.2545723993.

The spelling of 78542736 in words is "seventy-eight million, five hundred forty-two thousand, seven hundred thirty-six".