77890472 has 32 divisors (see below), whose sum is σ = 159667200. Its totient is φ = 35328000.

The previous prime is 77890471. The next prime is 77890499. The reversal of 77890472 is 27409877.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (77890471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67097 + ... + 68247.

It is an arithmetic number, because the mean of its divisors is an integer number (4989600).

Almost surely, 2^77890472 is an apocalyptic number.

It is an amenable number.

77890472 is an abundant number, since it is smaller than the sum of its proper divisors (81776728).

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

77890472 is a wasteful number, since it uses less digits than its factorization.

77890472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1933 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 44.

The square root of 77890472 is about 8825.5578860489. The cubic root of 77890472 is about 427.0657848468.

The spelling of 77890472 in words is "seventy-seven million, eight hundred ninety thousand, four hundred seventy-two".