30620640 has 48 divisors (see below), whose sum is σ = 96456528. Its totient is φ = 8165376.

The previous prime is 30620633. The next prime is 30620651. The reversal of 30620640 is 4602603.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31417 + ... + 32376.

It is an arithmetic number, because the mean of its divisors is an integer number (2009511).

Almost surely, 2^30620640 is an apocalyptic number.

30620640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30620640 is an abundant number, since it is smaller than the sum of its proper divisors (65835888).

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

30620640 is a wasteful number, since it uses less digits than its factorization.

30620640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63811 (or 63803 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 30620640 is about 5533.5919618273. The cubic root of 30620640 is about 312.8513892671.

The spelling of 30620640 in words is "thirty million, six hundred twenty thousand, six hundred forty".