77814438 has 32 divisors (see below), whose sum is σ = 169972992. Its totient is φ = 23604000.

The previous prime is 77814431. The next prime is 77814439. The reversal of 77814438 is 83441877.

It is a super-2 number, since 2×77814438² = 12110173522511688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77814438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77814431) 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 15 ways as a sum of consecutive naturals, for example, 1488 + ... + 12563.

It is an arithmetic number, because the mean of its divisors is an integer number (5311656).

Almost surely, 2^77814438 is an apocalyptic number.

77814438 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

77814438 is an abundant number, since it is smaller than the sum of its proper divisors (92158554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77814438 is a wasteful number, since it uses less digits than its factorization.

77814438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14140.

The product of its digits is 150528, while the sum is 42.

The square root of 77814438 is about 8821.2492312597. The cubic root of 77814438 is about 426.9267772949.

It can be divided in two parts, 77 and 814438, that multiplied together give a palindrome (62711726).

The spelling of 77814438 in words is "seventy-seven million, eight hundred fourteen thousand, four hundred thirty-eight".