77444990 has 48 divisors (see below), whose sum is σ = 164882304. Its totient is φ = 26107200.

The previous prime is 77444989. The next prime is 77444999. The reversal of 77444990 is 9944477.

It is a super-2 number, since 2×77444990² = 11995452952200200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77444999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28595 + ... + 31185.

It is an arithmetic number, because the mean of its divisors is an integer number (3435048).

Almost surely, 2^77444990 is an apocalyptic number.

77444990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77444990 is an abundant number, since it is smaller than the sum of its proper divisors (87437314).

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

77444990 is a wasteful number, since it uses less digits than its factorization.

77444990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2673 (or 2666 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 77444990 is about 8800.2835181601. The cubic root of 77444990 is about 426.2500497358.

The spelling of 77444990 in words is "seventy-seven million, four hundred forty-four thousand, nine hundred ninety".