77949438 has 128 divisors (see below), whose sum is σ = 203489280. Its totient is φ = 19388160.

The previous prime is 77949373. The next prime is 77949463. The reversal of 77949438 is 83494977.

It is a happy number.

It is a super-2 number, since 2×77949438² = 12152229769031688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 568906 + ... + 569042.

It is an arithmetic number, because the mean of its divisors is an integer number (1589760).

Almost surely, 2^77949438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77949438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101744640).

77949438 is an abundant number, since it is smaller than the sum of its proper divisors (125539842).

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

77949438 is a wasteful number, since it uses less digits than its factorization.

77949438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222.

The product of its digits is 1524096, while the sum is 51.

The square root of 77949438 is about 8828.8978927157. The cubic root of 77949438 is about 427.1735259198.

It can be divided in two parts, 77949 and 438, that added together give a palindrome (78387).

The spelling of 77949438 in words is "seventy-seven million, nine hundred forty-nine thousand, four hundred thirty-eight".