78469972 has 36 divisors (see below), whose sum is σ = 161251860. Its totient is φ = 33312384.

The previous prime is 78469967. The next prime is 78469987. The reversal of 78469972 is 27996487.

It can be written as a sum of positive squares in 2 ways, for example, as 26687556 + 51782416 = 5166^2 + 7196^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19528 + ... + 23200.

Almost surely, 2^78469972 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 78469972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80625930).

78469972 is an abundant number, since it is smaller than the sum of its proper divisors (82781888).

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

78469972 is a wasteful number, since it uses less digits than its factorization.

78469972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800 (or 3791 counting only the distinct ones).

The product of its digits is 1524096, while the sum is 52.

The square root of 78469972 is about 8858.3278331748. The cubic root of 78469972 is about 428.1222828748.

It can be divided in two parts, 784 and 69972, that added together give a square (70756 = 266²).

The spelling of 78469972 in words is "seventy-eight million, four hundred sixty-nine thousand, nine hundred seventy-two".