1621924764 has 48 divisors (see below), whose sum is σ = 3952451328. Its totient is φ = 516688128.

The previous prime is 1621924757. The next prime is 1621924771. The reversal of 1621924764 is 4674291261.

It is an interprime number because it is at equal distance from previous prime (1621924757) and next prime (1621924771).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488799 + ... + 492105.

It is an arithmetic number, because the mean of its divisors is an integer number (82342736).

Almost surely, 2^1621924764 is an apocalyptic number.

It is an amenable number.

1621924764 is an abundant number, since it is smaller than the sum of its proper divisors (2330526564).

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

1621924764 is a wasteful number, since it uses less digits than its factorization.

1621924764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114 (or 5112 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 1621924764 is about 40273.1270700451. The cubic root of 1621924764 is about 1174.9252438330.

The spelling of 1621924764 in words is "one billion, six hundred twenty-one million, nine hundred twenty-four thousand, seven hundred sixty-four".