1780979652 has 18 divisors (see below), whose sum is σ = 4501920878. Its totient is φ = 593659872.

The previous prime is 1780979647. The next prime is 1780979657. The reversal of 1780979652 is 2569790871.

It is an interprime number because it is at equal distance from previous prime (1780979647) and next prime (1780979657).

It can be written as a sum of positive squares in only one way, i.e., 1650471876 + 130507776 = 40626^2 + 11424^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1780979652² = 6343777041676082208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1780979657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24735793 + ... + 24735864.

Almost surely, 2^1780979652 is an apocalyptic number.

1780979652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1780979652 is an abundant number, since it is smaller than the sum of its proper divisors (2720941226).

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

1780979652 is a wasteful number, since it uses less digits than its factorization.

1780979652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49471667 (or 49471662 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The square root of 1780979652 is about 42201.6546121121. The cubic root of 1780979652 is about 1212.1405663193.

It can be divided in two parts, 17809 and 79652, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 1780979652 in words is "one billion, seven hundred eighty million, nine hundred seventy-nine thousand, six hundred fifty-two".