78435901 has 4 divisors (see below), whose sum is σ = 79540704. Its totient is φ = 77331100.

The previous prime is 78435887. The next prime is 78435937. The reversal of 78435901 is 10953487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78435901 - 2¹¹ = 78433853 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78435941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552295 + ... + 552436.

It is an arithmetic number, because the mean of its divisors is an integer number (19885176).

Almost surely, 2^78435901 is an apocalyptic number.

78435901 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78435901 is a deficient number, since it is larger than the sum of its proper divisors (1104803).

78435901 is a wasteful number, since it uses less digits than its factorization.

78435901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104802.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 78435901 is about 8856.4045187649. The cubic root of 78435901 is about 428.0603115433.

The spelling of 78435901 in words is "seventy-eight million, four hundred thirty-five thousand, nine hundred one".