78311402 has 16 divisors (see below), whose sum is σ = 126928032. Its totient is φ = 36022320.

The previous prime is 78311399. The next prime is 78311411. The reversal of 78311402 is 20411387.

It is a super-2 number, since 2×78311402² = 12265351366411208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3077 + ... + 12887.

It is an arithmetic number, because the mean of its divisors is an integer number (7933002).

Almost surely, 2^78311402 is an apocalyptic number.

78311402 is a deficient number, since it is larger than the sum of its proper divisors (48616630).

78311402 is a wasteful number, since it uses less digits than its factorization.

78311402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10133.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 78311402 is about 8849.3729721376. The cubic root of 78311402 is about 427.8337090914.

Adding to 78311402 its reverse (20411387), we get a palindrome (98722789).

The spelling of 78311402 in words is "seventy-eight million, three hundred eleven thousand, four hundred two".