78269408 has 48 divisors (see below), whose sum is σ = 178375680. Its totient is φ = 33111936.

The previous prime is 78269381. The next prime is 78269419. The reversal of 78269408 is 80496287.

It is a Cunningham number, because it is equal to 8847²-1.

It is a super-2 number, since 2×78269408² = 12252200457340928, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15485 + ... + 19907.

It is an arithmetic number, because the mean of its divisors is an integer number (3716160).

Almost surely, 2^78269408 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 78269408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89187840).

78269408 is an abundant number, since it is smaller than the sum of its proper divisors (100106272).

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

78269408 is a wasteful number, since it uses less digits than its factorization.

78269408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4519 (or 4511 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 78269408 is about 8846.9999434837. Note that the first 4 decimals coincide. The cubic root of 78269408 is about 427.7572210332.

The spelling of 78269408 in words is "seventy-eight million, two hundred sixty-nine thousand, four hundred eight".