77470992 has 150 divisors (see below), whose sum is σ = 236470542. Its totient is φ = 24482304.

The previous prime is 77470973. The next prime is 77470997. The reversal of 77470992 is 29907477.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 43877376 + 33593616 = 6624^2 + 5796^2 .

It is not an unprimeable number, because it can be changed into a prime (77470997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 685528 + ... + 685640.

Almost surely, 2^77470992 is an apocalyptic number.

77470992 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77470992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118235271).

77470992 is an abundant number, since it is smaller than the sum of its proper divisors (158999550).

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

77470992 is a wasteful number, since it uses less digits than its factorization.

77470992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 222264, while the sum is 45.

The square root of 77470992 is about 8801.7607329443. The cubic root of 77470992 is about 426.2977485976.

The spelling of 77470992 in words is "seventy-seven million, four hundred seventy thousand, nine hundred ninety-two".