78278730 has 32 divisors (see below), whose sum is σ = 190252800. Its totient is φ = 20609472.

The previous prime is 78278723. The next prime is 78278741. The reversal of 78278730 is 3787287.

It is a super-2 number, since 2×78278730² = 12255119140825800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14145 + ... + 18884.

It is an arithmetic number, because the mean of its divisors is an integer number (5945400).

Almost surely, 2^78278730 is an apocalyptic number.

78278730 is an abundant number, since it is smaller than the sum of its proper divisors (111974070).

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

78278730 is a wasteful number, since it uses less digits than its factorization.

78278730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33118.

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 78278730 is about 8847.5267730592. The cubic root of 78278730 is about 427.7742025275.

The spelling of 78278730 in words is "seventy-eight million, two hundred seventy-eight thousand, seven hundred thirty".