78249552 has 20 divisors (see below), whose sum is σ = 202144800. Its totient is φ = 26083168.

The previous prime is 78249533. The next prime is 78249553. The reversal of 78249552 is 25594287.

It is a super-2 number, since 2×78249552² = 12245984776401408, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78249553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815052 + ... + 815147.

It is an arithmetic number, because the mean of its divisors is an integer number (10107240).

Almost surely, 2^78249552 is an apocalyptic number.

It is an amenable number.

78249552 is an abundant number, since it is smaller than the sum of its proper divisors (123895248).

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

78249552 is a wasteful number, since it uses less digits than its factorization.

78249552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630210 (or 1630204 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 78249552 is about 8845.8776839837. The cubic root of 78249552 is about 427.7210457001.

The spelling of 78249552 in words is "seventy-eight million, two hundred forty-nine thousand, five hundred fifty-two".