74778390 has 48 divisors (see below), whose sum is σ = 201631248. Its totient is φ = 19940256.

The previous prime is 74778373. The next prime is 74778391. The reversal of 74778390 is 9387747.

It is a super-2 number, since 2×74778390² = 11183615221984200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74778391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12957 + ... + 17816.

It is an arithmetic number, because the mean of its divisors is an integer number (4200651).

Almost surely, 2^74778390 is an apocalyptic number.

74778390 is an abundant number, since it is smaller than the sum of its proper divisors (126852858).

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

74778390 is a wasteful number, since it uses less digits than its factorization.

74778390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30795 (or 30783 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 74778390 is about 8647.4499131247. The cubic root of 74778390 is about 421.3005604004.

The spelling of 74778390 in words is "seventy-four million, seven hundred seventy-eight thousand, three hundred ninety".