78387550 has 36 divisors (see below), whose sum is σ = 148358808. Its totient is φ = 30814000.

The previous prime is 78387523. The next prime is 78387553. The reversal of 78387550 is 5578387.

It is a super-2 number, since 2×78387550² = 12289215990005000, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78387497 and 78387506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78387553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 251895 + ... + 252205.

It is an arithmetic number, because the mean of its divisors is an integer number (4121078).

Almost surely, 2^78387550 is an apocalyptic number.

78387550 is a deficient number, since it is larger than the sum of its proper divisors (69971258).

78387550 is a wasteful number, since it uses less digits than its factorization.

78387550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 78387550 is about 8853.6743784713. The cubic root of 78387550 is about 427.9723356795.

The spelling of 78387550 in words is "seventy-eight million, three hundred eighty-seven thousand, five hundred fifty".