977765940 has 36 divisors (see below), whose sum is σ = 2965890564. Its totient is φ = 260737536.

The previous prime is 977765939. The next prime is 977765941. The reversal of 977765940 is 49567779.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (977765939) and next prime (977765941).

It can be written as a sum of positive squares in 2 ways, for example, as 165173904 + 812592036 = 12852^2 + 28506^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (977765941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2715837 + ... + 2716196.

It is an arithmetic number, because the mean of its divisors is an integer number (82385849).

Almost surely, 2^977765940 is an apocalyptic number.

977765940 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

977765940 is an abundant number, since it is smaller than the sum of its proper divisors (1988124624).

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

977765940 is a wasteful number, since it uses less digits than its factorization.

977765940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5432048 (or 5432043 counting only the distinct ones).

The product of its (nonzero) digits is 3333960, while the sum is 54.

The square root of 977765940 is about 31269.2491115473. The cubic root of 977765940 is about 992.5330297979.

The spelling of 977765940 in words is "nine hundred seventy-seven million, seven hundred sixty-five thousand, nine hundred forty".