102491580 has 48 divisors (see below), whose sum is σ = 296239104. Its totient is φ = 26448960.

The previous prime is 102491573. The next prime is 102491581. The reversal of 102491580 is 85194201.

It is a happy number.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102491581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25692 + ... + 29411.

It is an arithmetic number, because the mean of its divisors is an integer number (6171648).

Almost surely, 2^102491580 is an apocalyptic number.

102491580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102491580 is an abundant number, since it is smaller than the sum of its proper divisors (193747524).

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

102491580 is a wasteful number, since it uses less digits than its factorization.

102491580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55146 (or 55144 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 102491580 is about 10123.8125229579. The cubic root of 102491580 is about 467.9822661116.

The spelling of 102491580 in words is "one hundred two million, four hundred ninety-one thousand, five hundred eighty".