747978444 has 36 divisors (see below), whose sum is σ = 2001943944. Its totient is φ = 234659712.

The previous prime is 747978437. The next prime is 747978449. The reversal of 747978444 is 444879747.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×747978444² = 1118943505377322272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (747978449) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 610482 + ... + 611705.

It is an arithmetic number, because the mean of its divisors is an integer number (55609554).

Almost surely, 2^747978444 is an apocalyptic number.

It is an amenable number.

747978444 is an abundant number, since it is smaller than the sum of its proper divisors (1253965500).

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

747978444 is a wasteful number, since it uses less digits than its factorization.

747978444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222214 (or 1222209 counting only the distinct ones).

The product of its digits is 6322176, while the sum is 54.

The square root of 747978444 is about 27349.1945768061. The cubic root of 747978444 is about 907.7432483193.

The spelling of 747978444 in words is "seven hundred forty-seven million, nine hundred seventy-eight thousand, four hundred forty-four".