78407730 has 32 divisors (see below), whose sum is σ = 209088000. Its totient is φ = 20908656.

The previous prime is 78407729. The next prime is 78407741. The reversal of 78407730 is 3770487.

It is a happy number.

It is a super-2 number, since 2×78407730² = 12295544247505800, which contains 22 as substring.

It is a congruent number.

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, 144930 + ... + 145469.

It is an arithmetic number, because the mean of its divisors is an integer number (6534000).

Almost surely, 2^78407730 is an apocalyptic number.

78407730 is an abundant number, since it is smaller than the sum of its proper divisors (130680270).

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

78407730 is a wasteful number, since it uses less digits than its factorization.

78407730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290415 (or 290409 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The square root of 78407730 is about 8854.8139449680. The cubic root of 78407730 is about 428.0090580958.

The spelling of 78407730 in words is "seventy-eight million, four hundred seven thousand, seven hundred thirty".