78405492 has 48 divisors (see below), whose sum is σ = 201587904. Its totient is φ = 23520000.

The previous prime is 78405487. The next prime is 78405493. The reversal of 78405492 is 29450487.

It is a super-2 number, since 2×78405492² = 12294842351524128, 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 78405492.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78405493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10392 + ... + 16272.

It is an arithmetic number, because the mean of its divisors is an integer number (4199748).

Almost surely, 2^78405492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78405492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100793952).

78405492 is an abundant number, since it is smaller than the sum of its proper divisors (123182412).

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

78405492 is a wasteful number, since it uses less digits than its factorization.

78405492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000 (or 5998 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 78405492 is about 8854.6875721281. The cubic root of 78405492 is about 428.0049858213.

The spelling of 78405492 in words is "seventy-eight million, four hundred five thousand, four hundred ninety-two".