78161803 has 4 divisors (see below), whose sum is σ = 79636608. Its totient is φ = 76687000.

The previous prime is 78161789. The next prime is 78161807. The reversal of 78161803 is 30816187.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78161803 is a prime.

It is a super-2 number, since 2×78161803² = 12218534896421618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78161807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737323 + ... + 737428.

It is an arithmetic number, because the mean of its divisors is an integer number (19909152).

Almost surely, 2^78161803 is an apocalyptic number.

78161803 is a deficient number, since it is larger than the sum of its proper divisors (1474805).

78161803 is a wasteful number, since it uses less digits than its factorization.

78161803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474804.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 78161803 is about 8840.9164117754. The cubic root of 78161803 is about 427.5611038589.

The spelling of 78161803 in words is "seventy-eight million, one hundred sixty-one thousand, eight hundred three".