77869890 has 64 divisors (see below), whose sum is σ = 237323520. Its totient is φ = 17798400.

The previous prime is 77869873. The next prime is 77869921. The reversal of 77869890 is 9896877.

It is a super-2 number, since 2×77869890² = 12127439537224200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18711 + ... + 22490.

It is an arithmetic number, because the mean of its divisors is an integer number (3708180).

Almost surely, 2^77869890 is an apocalyptic number.

77869890 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77869890 is an abundant number, since it is smaller than the sum of its proper divisors (159453630).

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

77869890 is a wasteful number, since it uses less digits than its factorization.

77869890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41224 (or 41218 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The square root of 77869890 is about 8824.3917637421. The cubic root of 77869890 is about 427.0281651736.

The spelling of 77869890 in words is "seventy-seven million, eight hundred sixty-nine thousand, eight hundred ninety".