78151423 has 6 divisors (see below), whose sum is σ = 90910896. Its totient is φ = 66986892.

The previous prime is 78151421. The next prime is 78151441. The reversal of 78151423 is 32415187.

It is not a de Polignac number, because 78151423 - 2¹ = 78151421 is a prime.

It is a super-2 number, since 2×78151423² = 12215289833849858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78151421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 797415 + ... + 797512.

It is an arithmetic number, because the mean of its divisors is an integer number (15151816).

Almost surely, 2^78151423 is an apocalyptic number.

78151423 is a deficient number, since it is larger than the sum of its proper divisors (12759473).

78151423 is a wasteful number, since it uses less digits than its factorization.

78151423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594941 (or 1594934 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 78151423 is about 8840.3293490684. The cubic root of 78151423 is about 427.5421761109.

The spelling of 78151423 in words is "seventy-eight million, one hundred fifty-one thousand, four hundred twenty-three".