78440630 has 16 divisors (see below), whose sum is σ = 142514640. Its totient is φ = 31082592.

The previous prime is 78440611. The next prime is 78440641. The reversal of 78440630 is 3604487.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35585 + ... + 37724.

It is an arithmetic number, because the mean of its divisors is an integer number (8907165).

Almost surely, 2^78440630 is an apocalyptic number.

78440630 is a deficient number, since it is larger than the sum of its proper divisors (64074010).

78440630 is a wasteful number, since it uses less digits than its factorization.

78440630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73423.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 78440630 is about 8856.6714966741. The cubic root of 78440630 is about 428.0689141369.

It can be divided in two parts, 784 and 40630, that added together give a palindrome (41414).

The spelling of 78440630 in words is "seventy-eight million, four hundred forty thousand, six hundred thirty".