1977076890 has 64 divisors (see below), whose sum is σ = 5312545920. Its totient is φ = 523186560.

The previous prime is 1977076877. The next prime is 1977076891. The reversal of 1977076890 is 986707791.

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

It is not an unprimeable number, because it can be changed into a prime (1977076891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7422 + ... + 63318.

It is an arithmetic number, because the mean of its divisors is an integer number (83008530).

Almost surely, 2^1977076890 is an apocalyptic number.

1977076890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1977076890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2656272960).

1977076890 is an abundant number, since it is smaller than the sum of its proper divisors (3335469030).

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

1977076890 is a wasteful number, since it uses less digits than its factorization.

1977076890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56044 (or 56038 counting only the distinct ones).

The product of its (nonzero) digits is 1333584, while the sum is 54.

The square root of 1977076890 is about 44464.3327848288. The cubic root of 1977076890 is about 1255.0889901606.

The spelling of 1977076890 in words is "one billion, nine hundred seventy-seven million, seventy-six thousand, eight hundred ninety".