78121430 has 32 divisors (see below), whose sum is σ = 145281600. Its totient is φ = 30222720.

The previous prime is 78121429. The next prime is 78121453. The reversal of 78121430 is 3412187.

It is a super-2 number, since 2×78121430² = 12205915650489800, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 78121430.

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, 73100 + ... + 74160.

It is an arithmetic number, because the mean of its divisors is an integer number (4540050).

Almost surely, 2^78121430 is an apocalyptic number.

78121430 is a deficient number, since it is larger than the sum of its proper divisors (67160170).

78121430 is a wasteful number, since it uses less digits than its factorization.

78121430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 78121430 is about 8838.6328128280. The cubic root of 78121430 is about 427.4874749816.

The spelling of 78121430 in words is "seventy-eight million, one hundred twenty-one thousand, four hundred thirty".