80629780 has 96 divisors (see below), whose sum is σ = 216421632. Its totient is φ = 24499200.

The previous prime is 80629763. The next prime is 80629837. The reversal of 80629780 is 8792608.

80629780 = 391² + 392² + ... + 670².

It is a super-2 number, since 2×80629780² = 13002322845696800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 62502 + ... + 63778.

It is an arithmetic number, because the mean of its divisors is an integer number (2254392).

Almost surely, 2^80629780 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80629780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108210816).

80629780 is an abundant number, since it is smaller than the sum of its proper divisors (135791852).

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

80629780 is a wasteful number, since it uses less digits than its factorization.

80629780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1343 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 80629780 is about 8979.4086664991. The cubic root of 80629780 is about 432.0146671403.

The spelling of 80629780 in words is "eighty million, six hundred twenty-nine thousand, seven hundred eighty".