78550642 has 16 divisors (see below), whose sum is σ = 124921440. Its totient is φ = 36916288.

The previous prime is 78550627. The next prime is 78550651. The reversal of 78550642 is 24605587.

It is a happy number.

It is a super-2 number, since 2×78550642² = 12340406717224328, 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, 47709 + ... + 49327.

It is an arithmetic number, because the mean of its divisors is an integer number (7807590).

Almost surely, 2^78550642 is an apocalyptic number.

78550642 is a deficient number, since it is larger than the sum of its proper divisors (46370798).

78550642 is a wasteful number, since it uses less digits than its factorization.

78550642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3065.

The product of its (nonzero) digits is 67200, while the sum is 37.

The square root of 78550642 is about 8862.8800059574. The cubic root of 78550642 is about 428.2689410824.

The spelling of 78550642 in words is "seventy-eight million, five hundred fifty thousand, six hundred forty-two".