78325550 has 24 divisors (see below), whose sum is σ = 145919232. Its totient is φ = 31280000.

The previous prime is 78325529. The next prime is 78325571. The reversal of 78325550 is 5552387.

It is an interprime number because it is at equal distance from previous prime (78325529) and next prime (78325571).

It is a super-2 number, since 2×78325550² = 12269783565605000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78325550.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56870 + ... + 58230.

It is an arithmetic number, because the mean of its divisors is an integer number (6079968).

Almost surely, 2^78325550 is an apocalyptic number.

78325550 is a deficient number, since it is larger than the sum of its proper divisors (67593682).

78325550 is a wasteful number, since it uses less digits than its factorization.

78325550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524 (or 2519 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 78325550 is about 8850.1723147066. The cubic root of 78325550 is about 427.8594721632.

The spelling of 78325550 in words is "seventy-eight million, three hundred twenty-five thousand, five hundred fifty".