78402 has 16 divisors (see below), whose sum is σ = 159840. Its totient is φ = 25632.

The previous prime is 78401. The next prime is 78427. The reversal of 78402 is 20487.

It is a happy number.

78402 is nontrivially palindromic in base 14.

It is a super-2 number, since 2×78402² = 12293747208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349 + ... + 527.

It is an arithmetic number, because the mean of its divisors is an integer number (9990).

2⁷⁸⁴⁰² is an apocalyptic number.

78402 is an abundant number, since it is smaller than the sum of its proper divisors (81438).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79920).

78402 is a wasteful number, since it uses less digits than its factorization.

78402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 78402 is about 280.0035714058. The cubic root of 78402 is about 42.7998631608.

Adding to 78402 its reverse (20487), we get a palindrome (98889).

The spelling of 78402 in words is "seventy-eight thousand, four hundred two".